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Finding the Fourth Proportional to 861.27, 1,188.57 and 507.21

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Solution

The fourth proportional to 861.27, 1,188.57 and 507.21 is: 699.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.27 : 1,188.57 = 507.21 : x
  2. Step 2: Convert to fraction form
    861.27/1,188.57 = 507.21/x
  3. Step 3: Cross multiply
    861.27x = 1,188.57 × 507.21
  4. Step 4: Simplify right side
    861.27x = 602,854.59
  5. Step 5: Solve for x
    x = 602,854.59/861.27
  6. Step 6: Final answer
    x = 699.96

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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.