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Finding the Fourth Proportional to 235.50, 353.30 and 81.38

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Solution

The fourth proportional to 235.50, 353.30 and 81.38 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.50 : 353.30 = 81.38 : x
  2. Step 2: Convert to fraction form
    235.50/353.30 = 81.38/x
  3. Step 3: Cross multiply
    235.50x = 353.30 × 81.38
  4. Step 4: Simplify right side
    235.50x = 28,752.03
  5. Step 5: Solve for x
    x = 28,752.03/235.50
  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.