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Finding the Fourth Proportional to 15.12, 20.96 and 14.25

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Solution

The fourth proportional to 15.12, 20.96 and 14.25 is: 19.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.12 : 20.96 = 14.25 : x
  2. Step 2: Convert to fraction form
    15.12/20.96 = 14.25/x
  3. Step 3: Cross multiply
    15.12x = 20.96 × 14.25
  4. Step 4: Simplify right side
    15.12x = 298.61
  5. Step 5: Solve for x
    x = 298.61/15.12
  6. Step 6: Final answer
    x = 19.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.