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Finding the Fourth Proportional to 84.97, 117.29 and 52.21

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Solution

The fourth proportional to 84.97, 117.29 and 52.21 is: 72.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.97 : 117.29 = 52.21 : x
  2. Step 2: Convert to fraction form
    84.97/117.29 = 52.21/x
  3. Step 3: Cross multiply
    84.97x = 117.29 × 52.21
  4. Step 4: Simplify right side
    84.97x = 6,123.13
  5. Step 5: Solve for x
    x = 6,123.13/84.97
  6. Step 6: Final answer
    x = 72.06

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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.