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Finding the Fourth Proportional to 512.47, 707.13 and 291.43

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Solution

The fourth proportional to 512.47, 707.13 and 291.43 is: 402.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.47 : 707.13 = 291.43 : x
  2. Step 2: Convert to fraction form
    512.47/707.13 = 291.43/x
  3. Step 3: Cross multiply
    512.47x = 707.13 × 291.43
  4. Step 4: Simplify right side
    512.47x = 206,078.90
  5. Step 5: Solve for x
    x = 206,078.90/512.47
  6. Step 6: Final answer
    x = 402.13

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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.