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Finding the Fourth Proportional to 861.12, 1,189.13 and 626.42

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Solution

The fourth proportional to 861.12, 1,189.13 and 626.42 is: 865.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.12 : 1,189.13 = 626.42 : x
  2. Step 2: Convert to fraction form
    861.12/1,189.13 = 626.42/x
  3. Step 3: Cross multiply
    861.12x = 1,189.13 × 626.42
  4. Step 4: Simplify right side
    861.12x = 744,885.74
  5. Step 5: Solve for x
    x = 744,885.74/861.12
  6. Step 6: Final answer
    x = 865.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.