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Finding the Fourth Proportional to 14.65, 20.25 and 12.21

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Solution

The fourth proportional to 14.65, 20.25 and 12.21 is: 16.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.65 : 20.25 = 12.21 : x
  2. Step 2: Convert to fraction form
    14.65/20.25 = 12.21/x
  3. Step 3: Cross multiply
    14.65x = 20.25 × 12.21
  4. Step 4: Simplify right side
    14.65x = 247.19
  5. Step 5: Solve for x
    x = 247.19/14.65
  6. Step 6: Final answer
    x = 16.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.