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Finding the Fourth Proportional to 13.76, 20.61 and 12.48

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Solution

The fourth proportional to 13.76, 20.61 and 12.48 is: 18.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.76 : 20.61 = 12.48 : x
  2. Step 2: Convert to fraction form
    13.76/20.61 = 12.48/x
  3. Step 3: Cross multiply
    13.76x = 20.61 × 12.48
  4. Step 4: Simplify right side
    13.76x = 257.21
  5. Step 5: Solve for x
    x = 257.21/13.76
  6. Step 6: Final answer
    x = 18.70

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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.