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Finding the Fourth Proportional to 1,251.29, 1,726.63 and 691.69

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Solution

The fourth proportional to 1,251.29, 1,726.63 and 691.69 is: 954.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.29 : 1,726.63 = 691.69 : x
  2. Step 2: Convert to fraction form
    1,251.29/1,726.63 = 691.69/x
  3. Step 3: Cross multiply
    1,251.29x = 1,726.63 × 691.69
  4. Step 4: Simplify right side
    1,251.29x = 1,194,285.80
  5. Step 5: Solve for x
    x = 1,194,285.80/1,251.29
  6. Step 6: Final answer
    x = 954.44

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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.