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Finding the Fourth Proportional to 84.72, 127.32 and 81.48

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Solution

The fourth proportional to 84.72, 127.32 and 81.48 is: 122.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.72 : 127.32 = 81.48 : x
  2. Step 2: Convert to fraction form
    84.72/127.32 = 81.48/x
  3. Step 3: Cross multiply
    84.72x = 127.32 × 81.48
  4. Step 4: Simplify right side
    84.72x = 10,374.03
  5. Step 5: Solve for x
    x = 10,374.03/84.72
  6. Step 6: Final answer
    x = 122.45

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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.