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Finding the Fourth Proportional to 861.13, 1,289.87 and 534.90

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Solution

The fourth proportional to 861.13, 1,289.87 and 534.90 is: 801.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.13 : 1,289.87 = 534.90 : x
  2. Step 2: Convert to fraction form
    861.13/1,289.87 = 534.90/x
  3. Step 3: Cross multiply
    861.13x = 1,289.87 × 534.90
  4. Step 4: Simplify right side
    861.13x = 689,958.64
  5. Step 5: Solve for x
    x = 689,958.64/861.13
  6. Step 6: Final answer
    x = 801.22

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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.