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Finding the Fourth Proportional to 773.38, 1,157.15 and 542.72

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Solution

The fourth proportional to 773.38, 1,157.15 and 542.72 is: 812.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.38 : 1,157.15 = 542.72 : x
  2. Step 2: Convert to fraction form
    773.38/1,157.15 = 542.72/x
  3. Step 3: Cross multiply
    773.38x = 1,157.15 × 542.72
  4. Step 4: Simplify right side
    773.38x = 628,008.45
  5. Step 5: Solve for x
    x = 628,008.45/773.38
  6. Step 6: Final answer
    x = 812.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.