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Finding the Fourth Proportional to 321.80, 444.15 and 308.43

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Solution

The fourth proportional to 321.80, 444.15 and 308.43 is: 425.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.80 : 444.15 = 308.43 : x
  2. Step 2: Convert to fraction form
    321.80/444.15 = 308.43/x
  3. Step 3: Cross multiply
    321.80x = 444.15 × 308.43
  4. Step 4: Simplify right side
    321.80x = 136,989.18
  5. Step 5: Solve for x
    x = 136,989.18/321.80
  6. Step 6: Final answer
    x = 425.70

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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.