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Finding the Fourth Proportional to 21.44, 29.54 and 20.40

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Solution

The fourth proportional to 21.44, 29.54 and 20.40 is: 28.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.44 : 29.54 = 20.40 : x
  2. Step 2: Convert to fraction form
    21.44/29.54 = 20.40/x
  3. Step 3: Cross multiply
    21.44x = 29.54 × 20.40
  4. Step 4: Simplify right side
    21.44x = 602.62
  5. Step 5: Solve for x
    x = 602.62/21.44
  6. Step 6: Final answer
    x = 28.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.