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Finding the Fourth Proportional to 326.50, 489.87 and 172.42

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Solution

The fourth proportional to 326.50, 489.87 and 172.42 is: 258.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.50 : 489.87 = 172.42 : x
  2. Step 2: Convert to fraction form
    326.50/489.87 = 172.42/x
  3. Step 3: Cross multiply
    326.50x = 489.87 × 172.42
  4. Step 4: Simplify right side
    326.50x = 84,463.39
  5. Step 5: Solve for x
    x = 84,463.39/326.50
  6. Step 6: Final answer
    x = 258.69

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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.