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Finding the Fourth Proportional to 20.48, 28.15 and 17.98

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Solution

The fourth proportional to 20.48, 28.15 and 17.98 is: 24.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.48 : 28.15 = 17.98 : x
  2. Step 2: Convert to fraction form
    20.48/28.15 = 17.98/x
  3. Step 3: Cross multiply
    20.48x = 28.15 × 17.98
  4. Step 4: Simplify right side
    20.48x = 506.14
  5. Step 5: Solve for x
    x = 506.14/20.48
  6. Step 6: Final answer
    x = 24.71

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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.