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Finding the Fourth Proportional to 608,408.60, 839,716.20 and 390,889.20

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Solution

The fourth proportional to 608,408.60, 839,716.20 and 390,889.20 is: 539,499.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,408.60 : 839,716.20 = 390,889.20 : x
  2. Step 2: Convert to fraction form
    608,408.60/839,716.20 = 390,889.20/x
  3. Step 3: Cross multiply
    608,408.60x = 839,716.20 × 390,889.20
  4. Step 4: Simplify right side
    608,408.60x = 328,235,993,645.04
  5. Step 5: Solve for x
    x = 328,235,993,645.04/608,408.60
  6. Step 6: Final answer
    x = 539,499.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.