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Finding the Fourth Proportional to 1,151.91, 1,729.22 and 689.90

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Solution

The fourth proportional to 1,151.91, 1,729.22 and 689.90 is: 1,035.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.91 : 1,729.22 = 689.90 : x
  2. Step 2: Convert to fraction form
    1,151.91/1,729.22 = 689.90/x
  3. Step 3: Cross multiply
    1,151.91x = 1,729.22 × 689.90
  4. Step 4: Simplify right side
    1,151.91x = 1,192,976.78
  5. Step 5: Solve for x
    x = 1,192,976.78/1,151.91
  6. Step 6: Final answer
    x = 1,035.65

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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.