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Finding the Fourth Proportional to 326.97, 491.13 and 278.30

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Solution

The fourth proportional to 326.97, 491.13 and 278.30 is: 418.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.97 : 491.13 = 278.30 : x
  2. Step 2: Convert to fraction form
    326.97/491.13 = 278.30/x
  3. Step 3: Cross multiply
    326.97x = 491.13 × 278.30
  4. Step 4: Simplify right side
    326.97x = 136,682.71
  5. Step 5: Solve for x
    x = 136,682.71/326.97
  6. Step 6: Final answer
    x = 418.03

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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.