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Finding the Fourth Proportional to 765.10, 1,140.31 and 748.63

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Solution

The fourth proportional to 765.10, 1,140.31 and 748.63 is: 1,115.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.10 : 1,140.31 = 748.63 : x
  2. Step 2: Convert to fraction form
    765.10/1,140.31 = 748.63/x
  3. Step 3: Cross multiply
    765.10x = 1,140.31 × 748.63
  4. Step 4: Simplify right side
    765.10x = 853,670.28
  5. Step 5: Solve for x
    x = 853,670.28/765.10
  6. Step 6: Final answer
    x = 1,115.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.