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Finding the Fourth Proportional to 20.48, 30.72 and 14.52

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Solution

The fourth proportional to 20.48, 30.72 and 14.52 is: 21.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.48 : 30.72 = 14.52 : x
  2. Step 2: Convert to fraction form
    20.48/30.72 = 14.52/x
  3. Step 3: Cross multiply
    20.48x = 30.72 × 14.52
  4. Step 4: Simplify right side
    20.48x = 446.05
  5. Step 5: Solve for x
    x = 446.05/20.48
  6. Step 6: Final answer
    x = 21.78

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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.