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Finding the Fourth Proportional to 861.57, 1,292.76 and 496.26

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Solution

The fourth proportional to 861.57, 1,292.76 and 496.26 is: 744.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.57 : 1,292.76 = 496.26 : x
  2. Step 2: Convert to fraction form
    861.57/1,292.76 = 496.26/x
  3. Step 3: Cross multiply
    861.57x = 1,292.76 × 496.26
  4. Step 4: Simplify right side
    861.57x = 641,545.08
  5. Step 5: Solve for x
    x = 641,545.08/861.57
  6. Step 6: Final answer
    x = 744.62

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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.