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Finding the Fourth Proportional to 915.38, 1,262.91 and 542.48

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Solution

The fourth proportional to 915.38, 1,262.91 and 542.48 is: 748.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.38 : 1,262.91 = 542.48 : x
  2. Step 2: Convert to fraction form
    915.38/1,262.91 = 542.48/x
  3. Step 3: Cross multiply
    915.38x = 1,262.91 × 542.48
  4. Step 4: Simplify right side
    915.38x = 685,097.10
  5. Step 5: Solve for x
    x = 685,097.10/915.38
  6. Step 6: Final answer
    x = 748.43

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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.