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Finding the Fourth Proportional to 235.99, 353.90 and 81.87

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Solution

The fourth proportional to 235.99, 353.90 and 81.87 is: 122.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.99 : 353.90 = 81.87 : x
  2. Step 2: Convert to fraction form
    235.99/353.90 = 81.87/x
  3. Step 3: Cross multiply
    235.99x = 353.90 × 81.87
  4. Step 4: Simplify right side
    235.99x = 28,973.79
  5. Step 5: Solve for x
    x = 28,973.79/235.99
  6. Step 6: Final answer
    x = 122.78

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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.