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Finding the Fourth Proportional to 765.14, 1,146.42 and 547.76

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Solution

The fourth proportional to 765.14, 1,146.42 and 547.76 is: 820.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.14 : 1,146.42 = 547.76 : x
  2. Step 2: Convert to fraction form
    765.14/1,146.42 = 547.76/x
  3. Step 3: Cross multiply
    765.14x = 1,146.42 × 547.76
  4. Step 4: Simplify right side
    765.14x = 627,963.02
  5. Step 5: Solve for x
    x = 627,963.02/765.14
  6. Step 6: Final answer
    x = 820.72

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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.