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Finding the Fourth Proportional to 542.29, 748.20 and 306.15

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Solution

The fourth proportional to 542.29, 748.20 and 306.15 is: 422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.29 : 748.20 = 306.15 : x
  2. Step 2: Convert to fraction form
    542.29/748.20 = 306.15/x
  3. Step 3: Cross multiply
    542.29x = 748.20 × 306.15
  4. Step 4: Simplify right side
    542.29x = 229,061.64
  5. Step 5: Solve for x
    x = 229,061.64/542.29
  6. Step 6: Final answer
    x = 422.40

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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.