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Finding the Fourth Proportional to 20.54, 30.76 and 13.77

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Solution

The fourth proportional to 20.54, 30.76 and 13.77 is: 20.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.54 : 30.76 = 13.77 : x
  2. Step 2: Convert to fraction form
    20.54/30.76 = 13.77/x
  3. Step 3: Cross multiply
    20.54x = 30.76 × 13.77
  4. Step 4: Simplify right side
    20.54x = 423.57
  5. Step 5: Solve for x
    x = 423.57/20.54
  6. Step 6: Final answer
    x = 20.62

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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.