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Finding the Fourth Proportional to 18.86, 28.19 and 15.42

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Solution

The fourth proportional to 18.86, 28.19 and 15.42 is: 23.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.86 : 28.19 = 15.42 : x
  2. Step 2: Convert to fraction form
    18.86/28.19 = 15.42/x
  3. Step 3: Cross multiply
    18.86x = 28.19 × 15.42
  4. Step 4: Simplify right side
    18.86x = 434.61
  5. Step 5: Solve for x
    x = 434.61/18.86
  6. Step 6: Final answer
    x = 23.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.