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Finding the Fourth Proportional to 390,638.97, 539,121.96 and 237,688.29

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Solution

The fourth proportional to 390,638.97, 539,121.96 and 237,688.29 is: 328,034.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,638.97 : 539,121.96 = 237,688.29 : x
  2. Step 2: Convert to fraction form
    390,638.97/539,121.96 = 237,688.29/x
  3. Step 3: Cross multiply
    390,638.97x = 539,121.96 × 237,688.29
  4. Step 4: Simplify right side
    390,638.97x = 128,142,976,773.85
  5. Step 5: Solve for x
    x = 128,142,976,773.85/390,638.97
  6. Step 6: Final answer
    x = 328,034.29

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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.