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Finding the Fourth Proportional to 1,125.70, 1,689.10 and 759.68

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Solution

The fourth proportional to 1,125.70, 1,689.10 and 759.68 is: 1,139.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.70 : 1,689.10 = 759.68 : x
  2. Step 2: Convert to fraction form
    1,125.70/1,689.10 = 759.68/x
  3. Step 3: Cross multiply
    1,125.70x = 1,689.10 × 759.68
  4. Step 4: Simplify right side
    1,125.70x = 1,283,175.75
  5. Step 5: Solve for x
    x = 1,283,175.75/1,125.70
  6. Step 6: Final answer
    x = 1,139.89

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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.