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Finding the Fourth Proportional to 18, 27.15 and 17.79

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Solution

The fourth proportional to 18, 27.15 and 17.79 is: 26.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18 : 27.15 = 17.79 : x
  2. Step 2: Convert to fraction form
    18/27.15 = 17.79/x
  3. Step 3: Cross multiply
    18x = 27.15 × 17.79
  4. Step 4: Simplify right side
    18x = 483.00
  5. Step 5: Solve for x
    x = 483.00/18
  6. Step 6: Final answer
    x = 26.83

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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.