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Finding the Fourth Proportional to 13.71, 20.45 and 13.49

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Solution

The fourth proportional to 13.71, 20.45 and 13.49 is: 20.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.71 : 20.45 = 13.49 : x
  2. Step 2: Convert to fraction form
    13.71/20.45 = 13.49/x
  3. Step 3: Cross multiply
    13.71x = 20.45 × 13.49
  4. Step 4: Simplify right side
    13.71x = 275.87
  5. Step 5: Solve for x
    x = 275.87/13.71
  6. Step 6: Final answer
    x = 20.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.