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Finding the Fourth Proportional to 18.32, 27.47 and 12.31

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Solution

The fourth proportional to 18.32, 27.47 and 12.31 is: 18.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.32 : 27.47 = 12.31 : x
  2. Step 2: Convert to fraction form
    18.32/27.47 = 12.31/x
  3. Step 3: Cross multiply
    18.32x = 27.47 × 12.31
  4. Step 4: Simplify right side
    18.32x = 338.12
  5. Step 5: Solve for x
    x = 338.12/18.32
  6. Step 6: Final answer
    x = 18.46

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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.