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Finding the Fourth Proportional to 326.60, 489.86 and 131.70

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Solution

The fourth proportional to 326.60, 489.86 and 131.70 is: 197.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.60 : 489.86 = 131.70 : x
  2. Step 2: Convert to fraction form
    326.60/489.86 = 131.70/x
  3. Step 3: Cross multiply
    326.60x = 489.86 × 131.70
  4. Step 4: Simplify right side
    326.60x = 64,514.56
  5. Step 5: Solve for x
    x = 64,514.56/326.60
  6. Step 6: Final answer
    x = 197.54

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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.