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Finding the Fourth Proportional to 71.34, 106.97 and 30.72

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Solution

The fourth proportional to 71.34, 106.97 and 30.72 is: 46.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.34 : 106.97 = 30.72 : x
  2. Step 2: Convert to fraction form
    71.34/106.97 = 30.72/x
  3. Step 3: Cross multiply
    71.34x = 106.97 × 30.72
  4. Step 4: Simplify right side
    71.34x = 3,286.12
  5. Step 5: Solve for x
    x = 3,286.12/71.34
  6. Step 6: Final answer
    x = 46.06

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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.