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Finding the Fourth Proportional to 512.56, 707.28 and 291.47

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Solution

The fourth proportional to 512.56, 707.28 and 291.47 is: 402.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.56 : 707.28 = 291.47 : x
  2. Step 2: Convert to fraction form
    512.56/707.28 = 291.47/x
  3. Step 3: Cross multiply
    512.56x = 707.28 × 291.47
  4. Step 4: Simplify right side
    512.56x = 206,150.90
  5. Step 5: Solve for x
    x = 206,150.90/512.56
  6. Step 6: Final answer
    x = 402.20

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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.