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Finding the Fourth Proportional to 326.49, 489.67 and 121.15

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Solution

The fourth proportional to 326.49, 489.67 and 121.15 is: 181.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.49 : 489.67 = 121.15 : x
  2. Step 2: Convert to fraction form
    326.49/489.67 = 121.15/x
  3. Step 3: Cross multiply
    326.49x = 489.67 × 121.15
  4. Step 4: Simplify right side
    326.49x = 59,323.52
  5. Step 5: Solve for x
    x = 59,323.52/326.49
  6. Step 6: Final answer
    x = 181.70

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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.