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Finding the Fourth Proportional to 235.32, 353 and 81.25

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Solution

The fourth proportional to 235.32, 353 and 81.25 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.32 : 353 = 81.25 : x
  2. Step 2: Convert to fraction form
    235.32/353 = 81.25/x
  3. Step 3: Cross multiply
    235.32x = 353 × 81.25
  4. Step 4: Simplify right side
    235.32x = 28,679.49
  5. Step 5: Solve for x
    x = 28,679.49/235.32
  6. Step 6: Final answer
    x = 121.87

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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.