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Finding the Fourth Proportional to 84.97, 127.96 and 76.51

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Solution

The fourth proportional to 84.97, 127.96 and 76.51 is: 115.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.97 : 127.96 = 76.51 : x
  2. Step 2: Convert to fraction form
    84.97/127.96 = 76.51/x
  3. Step 3: Cross multiply
    84.97x = 127.96 × 76.51
  4. Step 4: Simplify right side
    84.97x = 9,790.22
  5. Step 5: Solve for x
    x = 9,790.22/84.97
  6. Step 6: Final answer
    x = 115.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.