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Finding the Fourth Proportional to 861.04, 1,291.32 and 724.12

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Solution

The fourth proportional to 861.04, 1,291.32 and 724.12 is: 1,085.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.04 : 1,291.32 = 724.12 : x
  2. Step 2: Convert to fraction form
    861.04/1,291.32 = 724.12/x
  3. Step 3: Cross multiply
    861.04x = 1,291.32 × 724.12
  4. Step 4: Simplify right side
    861.04x = 935,070.64
  5. Step 5: Solve for x
    x = 935,070.64/861.04
  6. Step 6: Final answer
    x = 1,085.98

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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.