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Finding the Fourth Proportional to 14.91, 20.42 and 14.88

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Solution

The fourth proportional to 14.91, 20.42 and 14.88 is: 20.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.91 : 20.42 = 14.88 : x
  2. Step 2: Convert to fraction form
    14.91/20.42 = 14.88/x
  3. Step 3: Cross multiply
    14.91x = 20.42 × 14.88
  4. Step 4: Simplify right side
    14.91x = 303.85
  5. Step 5: Solve for x
    x = 303.85/14.91
  6. Step 6: Final answer
    x = 20.38

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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.