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Finding the Fourth Proportional to 326.44, 489.20 and 172.06

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Solution

The fourth proportional to 326.44, 489.20 and 172.06 is: 257.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.44 : 489.20 = 172.06 : x
  2. Step 2: Convert to fraction form
    326.44/489.20 = 172.06/x
  3. Step 3: Cross multiply
    326.44x = 489.20 × 172.06
  4. Step 4: Simplify right side
    326.44x = 84,171.75
  5. Step 5: Solve for x
    x = 84,171.75/326.44
  6. Step 6: Final answer
    x = 257.85

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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.