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Finding the Fourth Proportional to 84.72, 127.05 and 80.94

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Solution

The fourth proportional to 84.72, 127.05 and 80.94 is: 121.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.72 : 127.05 = 80.94 : x
  2. Step 2: Convert to fraction form
    84.72/127.05 = 80.94/x
  3. Step 3: Cross multiply
    84.72x = 127.05 × 80.94
  4. Step 4: Simplify right side
    84.72x = 10,283.43
  5. Step 5: Solve for x
    x = 10,283.43/84.72
  6. Step 6: Final answer
    x = 121.38

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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.