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Finding the Fourth Proportional to 326.80, 489.86 and 172.90

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Solution

The fourth proportional to 326.80, 489.86 and 172.90 is: 259.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.80 : 489.86 = 172.90 : x
  2. Step 2: Convert to fraction form
    326.80/489.86 = 172.90/x
  3. Step 3: Cross multiply
    326.80x = 489.86 × 172.90
  4. Step 4: Simplify right side
    326.80x = 84,696.79
  5. Step 5: Solve for x
    x = 84,696.79/326.80
  6. Step 6: Final answer
    x = 259.17

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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.