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Finding the Fourth Proportional to 766.54, 1,057.52 and 542.80

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Solution

The fourth proportional to 766.54, 1,057.52 and 542.80 is: 748.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.54 : 1,057.52 = 542.80 : x
  2. Step 2: Convert to fraction form
    766.54/1,057.52 = 542.80/x
  3. Step 3: Cross multiply
    766.54x = 1,057.52 × 542.80
  4. Step 4: Simplify right side
    766.54x = 574,021.86
  5. Step 5: Solve for x
    x = 574,021.86/766.54
  6. Step 6: Final answer
    x = 748.85

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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.