Home / 638,831,420.70-958,247,131.05-409,248,908.70

Finding the Fourth Proportional to 638,831,420.70, 958,247,131.05 and 409,248,908.70

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Solution

The fourth proportional to 638,831,420.70, 958,247,131.05 and 409,248,908.70 is: 613,873,363.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,831,420.70 : 958,247,131.05 = 409,248,908.70 : x
  2. Step 2: Convert to fraction form
    638,831,420.70/958,247,131.05 = 409,248,908.70/x
  3. Step 3: Cross multiply
    638,831,420.70x = 958,247,131.05 × 409,248,908.70
  4. Step 4: Simplify right side
    638,831,420.70x = 392,161,592,647,118,336
  5. Step 5: Solve for x
    x = 392,161,592,647,118,336/638,831,420.70
  6. Step 6: Final answer
    x = 613,873,363.05

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Double scale
Find fourth proportional to 638,831,421.70, 958,247,132.55 and 409,248,909.70
Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.