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Finding the Fourth Proportional to 92.99, 138.52 and 87.86

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Solution

The fourth proportional to 92.99, 138.52 and 87.86 is: 130.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.99 : 138.52 = 87.86 : x
  2. Step 2: Convert to fraction form
    92.99/138.52 = 87.86/x
  3. Step 3: Cross multiply
    92.99x = 138.52 × 87.86
  4. Step 4: Simplify right side
    92.99x = 12,170.37
  5. Step 5: Solve for x
    x = 12,170.37/92.99
  6. Step 6: Final answer
    x = 130.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.