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Finding the Fourth Proportional to 759.25, 1,131.20 and 748.55

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Solution

The fourth proportional to 759.25, 1,131.20 and 748.55 is: 1,115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.25 : 1,131.20 = 748.55 : x
  2. Step 2: Convert to fraction form
    759.25/1,131.20 = 748.55/x
  3. Step 3: Cross multiply
    759.25x = 1,131.20 × 748.55
  4. Step 4: Simplify right side
    759.25x = 846,753.19
  5. Step 5: Solve for x
    x = 846,753.19/759.25
  6. Step 6: Final answer
    x = 1,115.25

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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.