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Finding the Fourth Proportional to 861.63, 1,292.02 and 614.70

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Solution

The fourth proportional to 861.63, 1,292.02 and 614.70 is: 921.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.63 : 1,292.02 = 614.70 : x
  2. Step 2: Convert to fraction form
    861.63/1,292.02 = 614.70/x
  3. Step 3: Cross multiply
    861.63x = 1,292.02 × 614.70
  4. Step 4: Simplify right side
    861.63x = 794,204.69
  5. Step 5: Solve for x
    x = 794,204.69/861.63
  6. Step 6: Final answer
    x = 921.75

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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.