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Finding the Fourth Proportional to 861.43, 1,188.76 and 468.44

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Solution

The fourth proportional to 861.43, 1,188.76 and 468.44 is: 646.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.43 : 1,188.76 = 468.44 : x
  2. Step 2: Convert to fraction form
    861.43/1,188.76 = 468.44/x
  3. Step 3: Cross multiply
    861.43x = 1,188.76 × 468.44
  4. Step 4: Simplify right side
    861.43x = 556,862.73
  5. Step 5: Solve for x
    x = 556,862.73/861.43
  6. Step 6: Final answer
    x = 646.44

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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.