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Finding the Fourth Proportional to 458,428.70, 687,643.05 and 290,467.10

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Solution

The fourth proportional to 458,428.70, 687,643.05 and 290,467.10 is: 435,700.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,428.70 : 687,643.05 = 290,467.10 : x
  2. Step 2: Convert to fraction form
    458,428.70/687,643.05 = 290,467.10/x
  3. Step 3: Cross multiply
    458,428.70x = 687,643.05 × 290,467.10
  4. Step 4: Simplify right side
    458,428.70x = 199,737,682,568.66
  5. Step 5: Solve for x
    x = 199,737,682,568.66/458,428.70
  6. Step 6: Final answer
    x = 435,700.65

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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.