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Finding the Fourth Proportional to 861.61, 1,281.36 and 834.27

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Solution

The fourth proportional to 861.61, 1,281.36 and 834.27 is: 1,240.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.61 : 1,281.36 = 834.27 : x
  2. Step 2: Convert to fraction form
    861.61/1,281.36 = 834.27/x
  3. Step 3: Cross multiply
    861.61x = 1,281.36 × 834.27
  4. Step 4: Simplify right side
    861.61x = 1,069,000.21
  5. Step 5: Solve for x
    x = 1,069,000.21/861.61
  6. Step 6: Final answer
    x = 1,240.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.