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Finding the Fourth Proportional to 18.68, 28.03 and 15.86

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Solution

The fourth proportional to 18.68, 28.03 and 15.86 is: 23.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.68 : 28.03 = 15.86 : x
  2. Step 2: Convert to fraction form
    18.68/28.03 = 15.86/x
  3. Step 3: Cross multiply
    18.68x = 28.03 × 15.86
  4. Step 4: Simplify right side
    18.68x = 444.56
  5. Step 5: Solve for x
    x = 444.56/18.68
  6. Step 6: Final answer
    x = 23.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.