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Finding the Fourth Proportional to 71.92, 107.70 and 42.96

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Solution

The fourth proportional to 71.92, 107.70 and 42.96 is: 64.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.92 : 107.70 = 42.96 : x
  2. Step 2: Convert to fraction form
    71.92/107.70 = 42.96/x
  3. Step 3: Cross multiply
    71.92x = 107.70 × 42.96
  4. Step 4: Simplify right side
    71.92x = 4,626.79
  5. Step 5: Solve for x
    x = 4,626.79/71.92
  6. Step 6: Final answer
    x = 64.33

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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.