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Finding the Fourth Proportional to 14.47, 21.69 and 13.57

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Solution

The fourth proportional to 14.47, 21.69 and 13.57 is: 20.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.47 : 21.69 = 13.57 : x
  2. Step 2: Convert to fraction form
    14.47/21.69 = 13.57/x
  3. Step 3: Cross multiply
    14.47x = 21.69 × 13.57
  4. Step 4: Simplify right side
    14.47x = 294.33
  5. Step 5: Solve for x
    x = 294.33/14.47
  6. Step 6: Final answer
    x = 20.34

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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.