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Finding the Fourth Proportional to 326.68, 490.15 and 143.95

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Solution

The fourth proportional to 326.68, 490.15 and 143.95 is: 215.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.68 : 490.15 = 143.95 : x
  2. Step 2: Convert to fraction form
    326.68/490.15 = 143.95/x
  3. Step 3: Cross multiply
    326.68x = 490.15 × 143.95
  4. Step 4: Simplify right side
    326.68x = 70,555.76
  5. Step 5: Solve for x
    x = 70,555.76/326.68
  6. Step 6: Final answer
    x = 215.98

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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.