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Finding the Fourth Proportional to 14.72, 21.97 and 13.28

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Solution

The fourth proportional to 14.72, 21.97 and 13.28 is: 19.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.72 : 21.97 = 13.28 : x
  2. Step 2: Convert to fraction form
    14.72/21.97 = 13.28/x
  3. Step 3: Cross multiply
    14.72x = 21.97 × 13.28
  4. Step 4: Simplify right side
    14.72x = 291.76
  5. Step 5: Solve for x
    x = 291.76/14.72
  6. Step 6: Final answer
    x = 19.82

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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.