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Finding the Fourth Proportional to 72.38, 108.45 and 33.86

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Solution

The fourth proportional to 72.38, 108.45 and 33.86 is: 50.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.38 : 108.45 = 33.86 : x
  2. Step 2: Convert to fraction form
    72.38/108.45 = 33.86/x
  3. Step 3: Cross multiply
    72.38x = 108.45 × 33.86
  4. Step 4: Simplify right side
    72.38x = 3,671.57
  5. Step 5: Solve for x
    x = 3,671.57/72.38
  6. Step 6: Final answer
    x = 50.73

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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.