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Finding the Fourth Proportional to 84.82, 117.12 and 74.91

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Solution

The fourth proportional to 84.82, 117.12 and 74.91 is: 103.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.82 : 117.12 = 74.91 : x
  2. Step 2: Convert to fraction form
    84.82/117.12 = 74.91/x
  3. Step 3: Cross multiply
    84.82x = 117.12 × 74.91
  4. Step 4: Simplify right side
    84.82x = 8,773.47
  5. Step 5: Solve for x
    x = 8,773.47/84.82
  6. Step 6: Final answer
    x = 103.43

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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.