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Finding the Fourth Proportional to 73.24, 108.90 and 71.12

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Solution

The fourth proportional to 73.24, 108.90 and 71.12 is: 105.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.24 : 108.90 = 71.12 : x
  2. Step 2: Convert to fraction form
    73.24/108.90 = 71.12/x
  3. Step 3: Cross multiply
    73.24x = 108.90 × 71.12
  4. Step 4: Simplify right side
    73.24x = 7,744.97
  5. Step 5: Solve for x
    x = 7,744.97/73.24
  6. Step 6: Final answer
    x = 105.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.