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Finding the Fourth Proportional to 1,129.93, 1,691.28 and 736.79

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Solution

The fourth proportional to 1,129.93, 1,691.28 and 736.79 is: 1,102.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.93 : 1,691.28 = 736.79 : x
  2. Step 2: Convert to fraction form
    1,129.93/1,691.28 = 736.79/x
  3. Step 3: Cross multiply
    1,129.93x = 1,691.28 × 736.79
  4. Step 4: Simplify right side
    1,129.93x = 1,246,109.73
  5. Step 5: Solve for x
    x = 1,246,109.73/1,129.93
  6. Step 6: Final answer
    x = 1,102.82

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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.