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Finding the Fourth Proportional to 1,125.28, 1,686.96 and 739.68

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Solution

The fourth proportional to 1,125.28, 1,686.96 and 739.68 is: 1,108.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.28 : 1,686.96 = 739.68 : x
  2. Step 2: Convert to fraction form
    1,125.28/1,686.96 = 739.68/x
  3. Step 3: Cross multiply
    1,125.28x = 1,686.96 × 739.68
  4. Step 4: Simplify right side
    1,125.28x = 1,247,810.57
  5. Step 5: Solve for x
    x = 1,247,810.57/1,125.28
  6. Step 6: Final answer
    x = 1,108.89

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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.