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Finding the Fourth Proportional to 326.35, 489.66 and 131.28

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Solution

The fourth proportional to 326.35, 489.66 and 131.28 is: 196.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.35 : 489.66 = 131.28 : x
  2. Step 2: Convert to fraction form
    326.35/489.66 = 131.28/x
  3. Step 3: Cross multiply
    326.35x = 489.66 × 131.28
  4. Step 4: Simplify right side
    326.35x = 64,282.56
  5. Step 5: Solve for x
    x = 64,282.56/326.35
  6. Step 6: Final answer
    x = 196.97

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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.