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Finding the Fourth Proportional to 23.20, 34.80 and 21.85

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Solution

The fourth proportional to 23.20, 34.80 and 21.85 is: 32.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.20 : 34.80 = 21.85 : x
  2. Step 2: Convert to fraction form
    23.20/34.80 = 21.85/x
  3. Step 3: Cross multiply
    23.20x = 34.80 × 21.85
  4. Step 4: Simplify right side
    23.20x = 760.38
  5. Step 5: Solve for x
    x = 760.38/23.20
  6. Step 6: Final answer
    x = 32.78

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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.