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Finding the Fourth Proportional to 84.29, 116.54 and 80.66

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Solution

The fourth proportional to 84.29, 116.54 and 80.66 is: 111.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.29 : 116.54 = 80.66 : x
  2. Step 2: Convert to fraction form
    84.29/116.54 = 80.66/x
  3. Step 3: Cross multiply
    84.29x = 116.54 × 80.66
  4. Step 4: Simplify right side
    84.29x = 9,400.12
  5. Step 5: Solve for x
    x = 9,400.12/84.29
  6. Step 6: Final answer
    x = 111.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.