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Finding the Fourth Proportional to 326.72, 489.72 and 153.20

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Solution

The fourth proportional to 326.72, 489.72 and 153.20 is: 229.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.72 : 489.72 = 153.20 : x
  2. Step 2: Convert to fraction form
    326.72/489.72 = 153.20/x
  3. Step 3: Cross multiply
    326.72x = 489.72 × 153.20
  4. Step 4: Simplify right side
    326.72x = 75,025.10
  5. Step 5: Solve for x
    x = 75,025.10/326.72
  6. Step 6: Final answer
    x = 229.63

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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.