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Finding the Fourth Proportional to 861.75, 1,189.19 and 468.78

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Solution

The fourth proportional to 861.75, 1,189.19 and 468.78 is: 646.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.75 : 1,189.19 = 468.78 : x
  2. Step 2: Convert to fraction form
    861.75/1,189.19 = 468.78/x
  3. Step 3: Cross multiply
    861.75x = 1,189.19 × 468.78
  4. Step 4: Simplify right side
    861.75x = 557,463.17
  5. Step 5: Solve for x
    x = 557,463.17/861.75
  6. Step 6: Final answer
    x = 646.89

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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.