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Finding the Fourth Proportional to 326.41, 489.60 and 143.91

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Solution

The fourth proportional to 326.41, 489.60 and 143.91 is: 215.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.41 : 489.60 = 143.91 : x
  2. Step 2: Convert to fraction form
    326.41/489.60 = 143.91/x
  3. Step 3: Cross multiply
    326.41x = 489.60 × 143.91
  4. Step 4: Simplify right side
    326.41x = 70,458.34
  5. Step 5: Solve for x
    x = 70,458.34/326.41
  6. Step 6: Final answer
    x = 215.86

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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.