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Finding the Fourth Proportional to 235.87, 354.04 and 138.56

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Solution

The fourth proportional to 235.87, 354.04 and 138.56 is: 207.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.87 : 354.04 = 138.56 : x
  2. Step 2: Convert to fraction form
    235.87/354.04 = 138.56/x
  3. Step 3: Cross multiply
    235.87x = 354.04 × 138.56
  4. Step 4: Simplify right side
    235.87x = 49,053.67
  5. Step 5: Solve for x
    x = 49,053.67/235.87
  6. Step 6: Final answer
    x = 207.97

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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.