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Finding the Fourth Proportional to 84.97, 116.66 and 77.68

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Solution

The fourth proportional to 84.97, 116.66 and 77.68 is: 106.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.97 : 116.66 = 77.68 : x
  2. Step 2: Convert to fraction form
    84.97/116.66 = 77.68/x
  3. Step 3: Cross multiply
    84.97x = 116.66 × 77.68
  4. Step 4: Simplify right side
    84.97x = 9,062.15
  5. Step 5: Solve for x
    x = 9,062.15/84.97
  6. Step 6: Final answer
    x = 106.65

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.