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Finding the Fourth Proportional to 28.30, 42.38 and 18.12

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Solution

The fourth proportional to 28.30, 42.38 and 18.12 is: 27.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.30 : 42.38 = 18.12 : x
  2. Step 2: Convert to fraction form
    28.30/42.38 = 18.12/x
  3. Step 3: Cross multiply
    28.30x = 42.38 × 18.12
  4. Step 4: Simplify right side
    28.30x = 767.93
  5. Step 5: Solve for x
    x = 767.93/28.30
  6. Step 6: Final answer
    x = 27.14

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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.