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Finding the Fourth Proportional to 939.52, 1,407.40 and 862.97

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Solution

The fourth proportional to 939.52, 1,407.40 and 862.97 is: 1,292.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.52 : 1,407.40 = 862.97 : x
  2. Step 2: Convert to fraction form
    939.52/1,407.40 = 862.97/x
  3. Step 3: Cross multiply
    939.52x = 1,407.40 × 862.97
  4. Step 4: Simplify right side
    939.52x = 1,214,543.98
  5. Step 5: Solve for x
    x = 1,214,543.98/939.52
  6. Step 6: Final answer
    x = 1,292.73

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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.