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Finding the Fourth Proportional to 18.20, 25.12 and 12.74

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Solution

The fourth proportional to 18.20, 25.12 and 12.74 is: 17.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.20 : 25.12 = 12.74 : x
  2. Step 2: Convert to fraction form
    18.20/25.12 = 12.74/x
  3. Step 3: Cross multiply
    18.20x = 25.12 × 12.74
  4. Step 4: Simplify right side
    18.20x = 320.18
  5. Step 5: Solve for x
    x = 320.18/18.20
  6. Step 6: Final answer
    x = 17.59

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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.