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Finding the Fourth Proportional to 92.81, 127.85 and 80.53

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Solution

The fourth proportional to 92.81, 127.85 and 80.53 is: 110.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.81 : 127.85 = 80.53 : x
  2. Step 2: Convert to fraction form
    92.81/127.85 = 80.53/x
  3. Step 3: Cross multiply
    92.81x = 127.85 × 80.53
  4. Step 4: Simplify right side
    92.81x = 10,295.04
  5. Step 5: Solve for x
    x = 10,295.04/92.81
  6. Step 6: Final answer
    x = 110.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.