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Finding the Fourth Proportional to 321.04, 443.21 and 247.20

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Solution

The fourth proportional to 321.04, 443.21 and 247.20 is: 341.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.04 : 443.21 = 247.20 : x
  2. Step 2: Convert to fraction form
    321.04/443.21 = 247.20/x
  3. Step 3: Cross multiply
    321.04x = 443.21 × 247.20
  4. Step 4: Simplify right side
    321.04x = 109,560.09
  5. Step 5: Solve for x
    x = 109,560.09/321.04
  6. Step 6: Final answer
    x = 341.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.