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Finding the Fourth Proportional to 14.85, 20.49 and 12.42

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Solution

The fourth proportional to 14.85, 20.49 and 12.42 is: 17.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.85 : 20.49 = 12.42 : x
  2. Step 2: Convert to fraction form
    14.85/20.49 = 12.42/x
  3. Step 3: Cross multiply
    14.85x = 20.49 × 12.42
  4. Step 4: Simplify right side
    14.85x = 254.44
  5. Step 5: Solve for x
    x = 254.44/14.85
  6. Step 6: Final answer
    x = 17.13

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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.