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Finding the Fourth Proportional to 21.38, 32.09 and 12.37

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Solution

The fourth proportional to 21.38, 32.09 and 12.37 is: 18.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.38 : 32.09 = 12.37 : x
  2. Step 2: Convert to fraction form
    21.38/32.09 = 12.37/x
  3. Step 3: Cross multiply
    21.38x = 32.09 × 12.37
  4. Step 4: Simplify right side
    21.38x = 396.95
  5. Step 5: Solve for x
    x = 396.95/21.38
  6. Step 6: Final answer
    x = 18.57

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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.