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Finding the Fourth Proportional to 1,247.40, 1,869.03 and 758.97

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Solution

The fourth proportional to 1,247.40, 1,869.03 and 758.97 is: 1,137.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.40 : 1,869.03 = 758.97 : x
  2. Step 2: Convert to fraction form
    1,247.40/1,869.03 = 758.97/x
  3. Step 3: Cross multiply
    1,247.40x = 1,869.03 × 758.97
  4. Step 4: Simplify right side
    1,247.40x = 1,418,537.70
  5. Step 5: Solve for x
    x = 1,418,537.70/1,247.40
  6. Step 6: Final answer
    x = 1,137.20

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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.