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Finding the Fourth Proportional to 326.54, 489.57 and 172.28

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Solution

The fourth proportional to 326.54, 489.57 and 172.28 is: 258.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.54 : 489.57 = 172.28 : x
  2. Step 2: Convert to fraction form
    326.54/489.57 = 172.28/x
  3. Step 3: Cross multiply
    326.54x = 489.57 × 172.28
  4. Step 4: Simplify right side
    326.54x = 84,343.12
  5. Step 5: Solve for x
    x = 84,343.12/326.54
  6. Step 6: Final answer
    x = 258.29

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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.