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Finding the Fourth Proportional to 326.25, 489.20 and 143.46

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Solution

The fourth proportional to 326.25, 489.20 and 143.46 is: 215.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.25 : 489.20 = 143.46 : x
  2. Step 2: Convert to fraction form
    326.25/489.20 = 143.46/x
  3. Step 3: Cross multiply
    326.25x = 489.20 × 143.46
  4. Step 4: Simplify right side
    326.25x = 70,179.91
  5. Step 5: Solve for x
    x = 70,179.91/326.25
  6. Step 6: Final answer
    x = 215.11

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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.