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Finding the Fourth Proportional to 28.25, 42.52 and 21.86

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Solution

The fourth proportional to 28.25, 42.52 and 21.86 is: 32.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.25 : 42.52 = 21.86 : x
  2. Step 2: Convert to fraction form
    28.25/42.52 = 21.86/x
  3. Step 3: Cross multiply
    28.25x = 42.52 × 21.86
  4. Step 4: Simplify right side
    28.25x = 929.49
  5. Step 5: Solve for x
    x = 929.49/28.25
  6. Step 6: Final answer
    x = 32.91

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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.