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Finding the Fourth Proportional to 18.38, 27.42 and 17.80

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Solution

The fourth proportional to 18.38, 27.42 and 17.80 is: 26.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.38 : 27.42 = 17.80 : x
  2. Step 2: Convert to fraction form
    18.38/27.42 = 17.80/x
  3. Step 3: Cross multiply
    18.38x = 27.42 × 17.80
  4. Step 4: Simplify right side
    18.38x = 488.08
  5. Step 5: Solve for x
    x = 488.08/18.38
  6. Step 6: Final answer
    x = 26.55

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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.