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Finding the Fourth Proportional to 92.28, 138.38 and 84.76

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Solution

The fourth proportional to 92.28, 138.38 and 84.76 is: 127.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.28 : 138.38 = 84.76 : x
  2. Step 2: Convert to fraction form
    92.28/138.38 = 84.76/x
  3. Step 3: Cross multiply
    92.28x = 138.38 × 84.76
  4. Step 4: Simplify right side
    92.28x = 11,728.32
  5. Step 5: Solve for x
    x = 11,728.32/92.28
  6. Step 6: Final answer
    x = 127.09

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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.