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Finding the Fourth Proportional to 84.42, 117.02 and 82.76

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Solution

The fourth proportional to 84.42, 117.02 and 82.76 is: 114.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.42 : 117.02 = 82.76 : x
  2. Step 2: Convert to fraction form
    84.42/117.02 = 82.76/x
  3. Step 3: Cross multiply
    84.42x = 117.02 × 82.76
  4. Step 4: Simplify right side
    84.42x = 9,684.20
  5. Step 5: Solve for x
    x = 9,684.20/84.42
  6. Step 6: Final answer
    x = 114.71

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.