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Finding the Fourth Proportional to 326.84, 490.25 and 121.40

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Solution

The fourth proportional to 326.84, 490.25 and 121.40 is: 182.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.84 : 490.25 = 121.40 : x
  2. Step 2: Convert to fraction form
    326.84/490.25 = 121.40/x
  3. Step 3: Cross multiply
    326.84x = 490.25 × 121.40
  4. Step 4: Simplify right side
    326.84x = 59,516.04
  5. Step 5: Solve for x
    x = 59,516.04/326.84
  6. Step 6: Final answer
    x = 182.10

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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.