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Finding the Fourth Proportional to 92.70, 138.90 and 89.29

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Solution

The fourth proportional to 92.70, 138.90 and 89.29 is: 133.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.70 : 138.90 = 89.29 : x
  2. Step 2: Convert to fraction form
    92.70/138.90 = 89.29/x
  3. Step 3: Cross multiply
    92.70x = 138.90 × 89.29
  4. Step 4: Simplify right side
    92.70x = 12,402.38
  5. Step 5: Solve for x
    x = 12,402.38/92.70
  6. Step 6: Final answer
    x = 133.79

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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.