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Finding the Fourth Proportional to 326.75, 490.66 and 217.40

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Solution

The fourth proportional to 326.75, 490.66 and 217.40 is: 326.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.75 : 490.66 = 217.40 : x
  2. Step 2: Convert to fraction form
    326.75/490.66 = 217.40/x
  3. Step 3: Cross multiply
    326.75x = 490.66 × 217.40
  4. Step 4: Simplify right side
    326.75x = 106,666.49
  5. Step 5: Solve for x
    x = 106,666.49/326.75
  6. Step 6: Final answer
    x = 326.45

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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.