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Finding the Fourth Proportional to 1,108.92, 1,531.17 and 689.88

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Solution

The fourth proportional to 1,108.92, 1,531.17 and 689.88 is: 952.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.92 : 1,531.17 = 689.88 : x
  2. Step 2: Convert to fraction form
    1,108.92/1,531.17 = 689.88/x
  3. Step 3: Cross multiply
    1,108.92x = 1,531.17 × 689.88
  4. Step 4: Simplify right side
    1,108.92x = 1,056,323.56
  5. Step 5: Solve for x
    x = 1,056,323.56/1,108.92
  6. Step 6: Final answer
    x = 952.57

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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.