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Finding the Fourth Proportional to 94.31, 141.40 and 71.46

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Solution

The fourth proportional to 94.31, 141.40 and 71.46 is: 107.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.31 : 141.40 = 71.46 : x
  2. Step 2: Convert to fraction form
    94.31/141.40 = 71.46/x
  3. Step 3: Cross multiply
    94.31x = 141.40 × 71.46
  4. Step 4: Simplify right side
    94.31x = 10,103.73
  5. Step 5: Solve for x
    x = 10,103.73/94.31
  6. Step 6: Final answer
    x = 107.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.