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Finding the Fourth Proportional to 23.88, 32.80 and 21.18

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Solution

The fourth proportional to 23.88, 32.80 and 21.18 is: 29.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.88 : 32.80 = 21.18 : x
  2. Step 2: Convert to fraction form
    23.88/32.80 = 21.18/x
  3. Step 3: Cross multiply
    23.88x = 32.80 × 21.18
  4. Step 4: Simplify right side
    23.88x = 694.70
  5. Step 5: Solve for x
    x = 694.70/23.88
  6. Step 6: Final answer
    x = 29.09

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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.