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Finding the Fourth Proportional to 20.44, 30.64 and 8.40

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Solution

The fourth proportional to 20.44, 30.64 and 8.40 is: 12.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.44 : 30.64 = 8.40 : x
  2. Step 2: Convert to fraction form
    20.44/30.64 = 8.40/x
  3. Step 3: Cross multiply
    20.44x = 30.64 × 8.40
  4. Step 4: Simplify right side
    20.44x = 257.38
  5. Step 5: Solve for x
    x = 257.38/20.44
  6. Step 6: Final answer
    x = 12.59

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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.