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Finding the Fourth Proportional to 939.48, 1,407.24 and 755.88

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Solution

The fourth proportional to 939.48, 1,407.24 and 755.88 is: 1,132.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.48 : 1,407.24 = 755.88 : x
  2. Step 2: Convert to fraction form
    939.48/1,407.24 = 755.88/x
  3. Step 3: Cross multiply
    939.48x = 1,407.24 × 755.88
  4. Step 4: Simplify right side
    939.48x = 1,063,704.57
  5. Step 5: Solve for x
    x = 1,063,704.57/939.48
  6. Step 6: Final answer
    x = 1,132.23

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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.