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Finding the Fourth Proportional to 235.47, 353.22 and 81.39

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Solution

The fourth proportional to 235.47, 353.22 and 81.39 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.47 : 353.22 = 81.39 : x
  2. Step 2: Convert to fraction form
    235.47/353.22 = 81.39/x
  3. Step 3: Cross multiply
    235.47x = 353.22 × 81.39
  4. Step 4: Simplify right side
    235.47x = 28,748.58
  5. Step 5: Solve for x
    x = 28,748.58/235.47
  6. Step 6: Final answer
    x = 122.09

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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.