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Finding the Fourth Proportional to 21.99, 33.24 and 21.90

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Solution

The fourth proportional to 21.99, 33.24 and 21.90 is: 33.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.99 : 33.24 = 21.90 : x
  2. Step 2: Convert to fraction form
    21.99/33.24 = 21.90/x
  3. Step 3: Cross multiply
    21.99x = 33.24 × 21.90
  4. Step 4: Simplify right side
    21.99x = 727.96
  5. Step 5: Solve for x
    x = 727.96/21.99
  6. Step 6: Final answer
    x = 33.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.