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Finding the Fourth Proportional to 326.47, 489.60 and 172.31

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Solution

The fourth proportional to 326.47, 489.60 and 172.31 is: 258.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.47 : 489.60 = 172.31 : x
  2. Step 2: Convert to fraction form
    326.47/489.60 = 172.31/x
  3. Step 3: Cross multiply
    326.47x = 489.60 × 172.31
  4. Step 4: Simplify right side
    326.47x = 84,363.93
  5. Step 5: Solve for x
    x = 84,363.93/326.47
  6. Step 6: Final answer
    x = 258.41

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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.