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Finding the Fourth Proportional to 1,272.57, 1,755.66 and 748.61

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Solution

The fourth proportional to 1,272.57, 1,755.66 and 748.61 is: 1,032.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.57 : 1,755.66 = 748.61 : x
  2. Step 2: Convert to fraction form
    1,272.57/1,755.66 = 748.61/x
  3. Step 3: Cross multiply
    1,272.57x = 1,755.66 × 748.61
  4. Step 4: Simplify right side
    1,272.57x = 1,314,295.85
  5. Step 5: Solve for x
    x = 1,314,295.85/1,272.57
  6. Step 6: Final answer
    x = 1,032.79

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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.