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Finding the Fourth Proportional to 326.31, 489.15 and 131.19

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Solution

The fourth proportional to 326.31, 489.15 and 131.19 is: 196.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.31 : 489.15 = 131.19 : x
  2. Step 2: Convert to fraction form
    326.31/489.15 = 131.19/x
  3. Step 3: Cross multiply
    326.31x = 489.15 × 131.19
  4. Step 4: Simplify right side
    326.31x = 64,171.59
  5. Step 5: Solve for x
    x = 64,171.59/326.31
  6. Step 6: Final answer
    x = 196.66

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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.