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Finding the Fourth Proportional to 24.42, 33.70 and 21.80

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Solution

The fourth proportional to 24.42, 33.70 and 21.80 is: 30.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    24.42 : 33.70 = 21.80 : x
  2. Step 2: Convert to fraction form
    24.42/33.70 = 21.80/x
  3. Step 3: Cross multiply
    24.42x = 33.70 × 21.80
  4. Step 4: Simplify right side
    24.42x = 734.66
  5. Step 5: Solve for x
    x = 734.66/24.42
  6. Step 6: Final answer
    x = 30.08

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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.