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Finding the Fourth Proportional to 326.72, 489.90 and 172.62

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Solution

The fourth proportional to 326.72, 489.90 and 172.62 is: 258.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.72 : 489.90 = 172.62 : x
  2. Step 2: Convert to fraction form
    326.72/489.90 = 172.62/x
  3. Step 3: Cross multiply
    326.72x = 489.90 × 172.62
  4. Step 4: Simplify right side
    326.72x = 84,566.54
  5. Step 5: Solve for x
    x = 84,566.54/326.72
  6. Step 6: Final answer
    x = 258.83

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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.