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Finding the Fourth Proportional to 191.91, 287.86 and 83.78

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Solution

The fourth proportional to 191.91, 287.86 and 83.78 is: 125.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.91 : 287.86 = 83.78 : x
  2. Step 2: Convert to fraction form
    191.91/287.86 = 83.78/x
  3. Step 3: Cross multiply
    191.91x = 287.86 × 83.78
  4. Step 4: Simplify right side
    191.91x = 24,115.26
  5. Step 5: Solve for x
    x = 24,115.26/191.91
  6. Step 6: Final answer
    x = 125.66

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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.