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Finding the Fourth Proportional to 326.27, 489.34 and 143.61

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Solution

The fourth proportional to 326.27, 489.34 and 143.61 is: 215.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.27 : 489.34 = 143.61 : x
  2. Step 2: Convert to fraction form
    326.27/489.34 = 143.61/x
  3. Step 3: Cross multiply
    326.27x = 489.34 × 143.61
  4. Step 4: Simplify right side
    326.27x = 70,273.76
  5. Step 5: Solve for x
    x = 70,273.76/326.27
  6. Step 6: Final answer
    x = 215.39

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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.