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Finding the Fourth Proportional to 14.74, 20.31 and 13.18

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Solution

The fourth proportional to 14.74, 20.31 and 13.18 is: 18.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.74 : 20.31 = 13.18 : x
  2. Step 2: Convert to fraction form
    14.74/20.31 = 13.18/x
  3. Step 3: Cross multiply
    14.74x = 20.31 × 13.18
  4. Step 4: Simplify right side
    14.74x = 267.69
  5. Step 5: Solve for x
    x = 267.69/14.74
  6. Step 6: Final answer
    x = 18.16

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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.