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Finding the Fourth Proportional to 21.41, 29.32 and 20.60

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Solution

The fourth proportional to 21.41, 29.32 and 20.60 is: 28.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.41 : 29.32 = 20.60 : x
  2. Step 2: Convert to fraction form
    21.41/29.32 = 20.60/x
  3. Step 3: Cross multiply
    21.41x = 29.32 × 20.60
  4. Step 4: Simplify right side
    21.41x = 603.85
  5. Step 5: Solve for x
    x = 603.85/21.41
  6. Step 6: Final answer
    x = 28.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.