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Finding the Fourth Proportional to 21.38, 32.05 and 9.18

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Solution

The fourth proportional to 21.38, 32.05 and 9.18 is: 13.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.38 : 32.05 = 9.18 : x
  2. Step 2: Convert to fraction form
    21.38/32.05 = 9.18/x
  3. Step 3: Cross multiply
    21.38x = 32.05 × 9.18
  4. Step 4: Simplify right side
    21.38x = 294.17
  5. Step 5: Solve for x
    x = 294.17/21.38
  6. Step 6: Final answer
    x = 13.76

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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.