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Finding the Fourth Proportional to 321.49, 444 and 256.47

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Solution

The fourth proportional to 321.49, 444 and 256.47 is: 354.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.49 : 444 = 256.47 : x
  2. Step 2: Convert to fraction form
    321.49/444 = 256.47/x
  3. Step 3: Cross multiply
    321.49x = 444 × 256.47
  4. Step 4: Simplify right side
    321.49x = 113,872.68
  5. Step 5: Solve for x
    x = 113,872.68/321.49
  6. Step 6: Final answer
    x = 354.20

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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.