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Finding the Fourth Proportional to 326.22, 489.18 and 143.56

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Solution

The fourth proportional to 326.22, 489.18 and 143.56 is: 215.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.22 : 489.18 = 143.56 : x
  2. Step 2: Convert to fraction form
    326.22/489.18 = 143.56/x
  3. Step 3: Cross multiply
    326.22x = 489.18 × 143.56
  4. Step 4: Simplify right side
    326.22x = 70,226.68
  5. Step 5: Solve for x
    x = 70,226.68/326.22
  6. Step 6: Final answer
    x = 215.27

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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.