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Finding the Fourth Proportional to 92.15, 138.33 and 77.88

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Solution

The fourth proportional to 92.15, 138.33 and 77.88 is: 116.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.15 : 138.33 = 77.88 : x
  2. Step 2: Convert to fraction form
    92.15/138.33 = 77.88/x
  3. Step 3: Cross multiply
    92.15x = 138.33 × 77.88
  4. Step 4: Simplify right side
    92.15x = 10,773.29
  5. Step 5: Solve for x
    x = 10,773.29/92.15
  6. Step 6: Final answer
    x = 116.91

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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.