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Finding the Fourth Proportional to 1,149.38, 1,723.94 and 781.55

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Solution

The fourth proportional to 1,149.38, 1,723.94 and 781.55 is: 1,172.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.38 : 1,723.94 = 781.55 : x
  2. Step 2: Convert to fraction form
    1,149.38/1,723.94 = 781.55/x
  3. Step 3: Cross multiply
    1,149.38x = 1,723.94 × 781.55
  4. Step 4: Simplify right side
    1,149.38x = 1,347,332.78
  5. Step 5: Solve for x
    x = 1,347,332.78/1,149.38
  6. Step 6: Final answer
    x = 1,172.23

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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.