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Finding the Fourth Proportional to 235.52, 353.22 and 91.20

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Solution

The fourth proportional to 235.52, 353.22 and 91.20 is: 136.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.52 : 353.22 = 91.20 : x
  2. Step 2: Convert to fraction form
    235.52/353.22 = 91.20/x
  3. Step 3: Cross multiply
    235.52x = 353.22 × 91.20
  4. Step 4: Simplify right side
    235.52x = 32,213.66
  5. Step 5: Solve for x
    x = 32,213.66/235.52
  6. Step 6: Final answer
    x = 136.78

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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.