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Finding the Fourth Proportional to 92.28, 138.72 and 85.62

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Solution

The fourth proportional to 92.28, 138.72 and 85.62 is: 128.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.28 : 138.72 = 85.62 : x
  2. Step 2: Convert to fraction form
    92.28/138.72 = 85.62/x
  3. Step 3: Cross multiply
    92.28x = 138.72 × 85.62
  4. Step 4: Simplify right side
    92.28x = 11,877.21
  5. Step 5: Solve for x
    x = 11,877.21/92.28
  6. Step 6: Final answer
    x = 128.71

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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.