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Finding the Fourth Proportional to 3,187.92, 4,781.88 and 879.42

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Solution

The fourth proportional to 3,187.92, 4,781.88 and 879.42 is: 1,319.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,187.92 : 4,781.88 = 879.42 : x
  2. Step 2: Convert to fraction form
    3,187.92/4,781.88 = 879.42/x
  3. Step 3: Cross multiply
    3,187.92x = 4,781.88 × 879.42
  4. Step 4: Simplify right side
    3,187.92x = 4,205,280.91
  5. Step 5: Solve for x
    x = 4,205,280.91/3,187.92
  6. Step 6: Final answer
    x = 1,319.13

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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.