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Finding the Fourth Proportional to 839.19, 1,258.78 and 326.19

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Solution

The fourth proportional to 839.19, 1,258.78 and 326.19 is: 489.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.19 : 1,258.78 = 326.19 : x
  2. Step 2: Convert to fraction form
    839.19/1,258.78 = 326.19/x
  3. Step 3: Cross multiply
    839.19x = 1,258.78 × 326.19
  4. Step 4: Simplify right side
    839.19x = 410,601.45
  5. Step 5: Solve for x
    x = 410,601.45/839.19
  6. Step 6: Final answer
    x = 489.28

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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.