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Finding the Fourth Proportional to 20.80, 28.72 and 17.74

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Solution

The fourth proportional to 20.80, 28.72 and 17.74 is: 24.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.80 : 28.72 = 17.74 : x
  2. Step 2: Convert to fraction form
    20.80/28.72 = 17.74/x
  3. Step 3: Cross multiply
    20.80x = 28.72 × 17.74
  4. Step 4: Simplify right side
    20.80x = 509.49
  5. Step 5: Solve for x
    x = 509.49/20.80
  6. Step 6: Final answer
    x = 24.49

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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.