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Finding the Fourth Proportional to 123.96, 185.98 and 87.86

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Solution

The fourth proportional to 123.96, 185.98 and 87.86 is: 131.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.96 : 185.98 = 87.86 : x
  2. Step 2: Convert to fraction form
    123.96/185.98 = 87.86/x
  3. Step 3: Cross multiply
    123.96x = 185.98 × 87.86
  4. Step 4: Simplify right side
    123.96x = 16,340.20
  5. Step 5: Solve for x
    x = 16,340.20/123.96
  6. Step 6: Final answer
    x = 131.82

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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.