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Finding the Fourth Proportional to 84.89, 127.97 and 79.31

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Solution

The fourth proportional to 84.89, 127.97 and 79.31 is: 119.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.89 : 127.97 = 79.31 : x
  2. Step 2: Convert to fraction form
    84.89/127.97 = 79.31/x
  3. Step 3: Cross multiply
    84.89x = 127.97 × 79.31
  4. Step 4: Simplify right side
    84.89x = 10,148.26
  5. Step 5: Solve for x
    x = 10,148.26/84.89
  6. Step 6: Final answer
    x = 119.55

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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.