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Finding the Fourth Proportional to 18.83, 28.31 and 15

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Solution

The fourth proportional to 18.83, 28.31 and 15 is: 22.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.83 : 28.31 = 15 : x
  2. Step 2: Convert to fraction form
    18.83/28.31 = 15/x
  3. Step 3: Cross multiply
    18.83x = 28.31 × 15
  4. Step 4: Simplify right side
    18.83x = 424.58
  5. Step 5: Solve for x
    x = 424.58/18.83
  6. Step 6: Final answer
    x = 22.55

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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.