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Finding the Fourth Proportional to 531.31, 732.21 and 398.29

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Solution

The fourth proportional to 531.31, 732.21 and 398.29 is: 548.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.31 : 732.21 = 398.29 : x
  2. Step 2: Convert to fraction form
    531.31/732.21 = 398.29/x
  3. Step 3: Cross multiply
    531.31x = 732.21 × 398.29
  4. Step 4: Simplify right side
    531.31x = 291,635.39
  5. Step 5: Solve for x
    x = 291,635.39/531.31
  6. Step 6: Final answer
    x = 548.90

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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.