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Finding the Fourth Proportional to 326.61, 489.68 and 153.18

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Solution

The fourth proportional to 326.61, 489.68 and 153.18 is: 229.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.61 : 489.68 = 153.18 : x
  2. Step 2: Convert to fraction form
    326.61/489.68 = 153.18/x
  3. Step 3: Cross multiply
    326.61x = 489.68 × 153.18
  4. Step 4: Simplify right side
    326.61x = 75,009.18
  5. Step 5: Solve for x
    x = 75,009.18/326.61
  6. Step 6: Final answer
    x = 229.66

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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.