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Finding the Fourth Proportional to 402.17, 602.55 and 387.18

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Solution

The fourth proportional to 402.17, 602.55 and 387.18 is: 580.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.17 : 602.55 = 387.18 : x
  2. Step 2: Convert to fraction form
    402.17/602.55 = 387.18/x
  3. Step 3: Cross multiply
    402.17x = 602.55 × 387.18
  4. Step 4: Simplify right side
    402.17x = 233,295.31
  5. Step 5: Solve for x
    x = 233,295.31/402.17
  6. Step 6: Final answer
    x = 580.10

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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.