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Finding the Fourth Proportional to 20.29, 28.15 and 18.49

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Solution

The fourth proportional to 20.29, 28.15 and 18.49 is: 25.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.29 : 28.15 = 18.49 : x
  2. Step 2: Convert to fraction form
    20.29/28.15 = 18.49/x
  3. Step 3: Cross multiply
    20.29x = 28.15 × 18.49
  4. Step 4: Simplify right side
    20.29x = 520.49
  5. Step 5: Solve for x
    x = 520.49/20.29
  6. Step 6: Final answer
    x = 25.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.