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Finding the Fourth Proportional to 24.30, 33.57 and 21.87

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Solution

The fourth proportional to 24.30, 33.57 and 21.87 is: 30.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    24.30 : 33.57 = 21.87 : x
  2. Step 2: Convert to fraction form
    24.30/33.57 = 21.87/x
  3. Step 3: Cross multiply
    24.30x = 33.57 × 21.87
  4. Step 4: Simplify right side
    24.30x = 734.18
  5. Step 5: Solve for x
    x = 734.18/24.30
  6. Step 6: Final answer
    x = 30.21

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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.