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Finding the Fourth Proportional to 191.72, 287.60 and 81.96

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Solution

The fourth proportional to 191.72, 287.60 and 81.96 is: 122.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.72 : 287.60 = 81.96 : x
  2. Step 2: Convert to fraction form
    191.72/287.60 = 81.96/x
  3. Step 3: Cross multiply
    191.72x = 287.60 × 81.96
  4. Step 4: Simplify right side
    191.72x = 23,572.29
  5. Step 5: Solve for x
    x = 23,572.29/191.72
  6. Step 6: Final answer
    x = 122.95

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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.