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Finding the Fourth Proportional to 84.80, 116.87 and 66.78

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Solution

The fourth proportional to 84.80, 116.87 and 66.78 is: 92.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.80 : 116.87 = 66.78 : x
  2. Step 2: Convert to fraction form
    84.80/116.87 = 66.78/x
  3. Step 3: Cross multiply
    84.80x = 116.87 × 66.78
  4. Step 4: Simplify right side
    84.80x = 7,804.58
  5. Step 5: Solve for x
    x = 7,804.58/84.80
  6. Step 6: Final answer
    x = 92.04

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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.