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Finding the Fourth Proportional to 22.50, 33.80 and 21.13

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Solution

The fourth proportional to 22.50, 33.80 and 21.13 is: 31.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.50 : 33.80 = 21.13 : x
  2. Step 2: Convert to fraction form
    22.50/33.80 = 21.13/x
  3. Step 3: Cross multiply
    22.50x = 33.80 × 21.13
  4. Step 4: Simplify right side
    22.50x = 714.19
  5. Step 5: Solve for x
    x = 714.19/22.50
  6. Step 6: Final answer
    x = 31.74

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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.