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Finding the Fourth Proportional to 20.68, 28.56 and 16.42

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Solution

The fourth proportional to 20.68, 28.56 and 16.42 is: 22.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.68 : 28.56 = 16.42 : x
  2. Step 2: Convert to fraction form
    20.68/28.56 = 16.42/x
  3. Step 3: Cross multiply
    20.68x = 28.56 × 16.42
  4. Step 4: Simplify right side
    20.68x = 468.96
  5. Step 5: Solve for x
    x = 468.96/20.68
  6. Step 6: Final answer
    x = 22.68

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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.