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Finding the Fourth Proportional to 13.86, 20.63 and 13.58

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Solution

The fourth proportional to 13.86, 20.63 and 13.58 is: 20.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.86 : 20.63 = 13.58 : x
  2. Step 2: Convert to fraction form
    13.86/20.63 = 13.58/x
  3. Step 3: Cross multiply
    13.86x = 20.63 × 13.58
  4. Step 4: Simplify right side
    13.86x = 280.16
  5. Step 5: Solve for x
    x = 280.16/13.86
  6. Step 6: Final answer
    x = 20.21

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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.