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Finding the Fourth Proportional to 92.84, 138.78 and 80.14

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Solution

The fourth proportional to 92.84, 138.78 and 80.14 is: 119.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.84 : 138.78 = 80.14 : x
  2. Step 2: Convert to fraction form
    92.84/138.78 = 80.14/x
  3. Step 3: Cross multiply
    92.84x = 138.78 × 80.14
  4. Step 4: Simplify right side
    92.84x = 11,121.83
  5. Step 5: Solve for x
    x = 11,121.83/92.84
  6. Step 6: Final answer
    x = 119.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.