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Finding the Fourth Proportional to 14.75, 20.25 and 12.88

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Solution

The fourth proportional to 14.75, 20.25 and 12.88 is: 17.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.75 : 20.25 = 12.88 : x
  2. Step 2: Convert to fraction form
    14.75/20.25 = 12.88/x
  3. Step 3: Cross multiply
    14.75x = 20.25 × 12.88
  4. Step 4: Simplify right side
    14.75x = 260.82
  5. Step 5: Solve for x
    x = 260.82/14.75
  6. Step 6: Final answer
    x = 17.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.