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Finding the Fourth Proportional to 321.24, 443.70 and 279.66

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Solution

The fourth proportional to 321.24, 443.70 and 279.66 is: 386.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.24 : 443.70 = 279.66 : x
  2. Step 2: Convert to fraction form
    321.24/443.70 = 279.66/x
  3. Step 3: Cross multiply
    321.24x = 443.70 × 279.66
  4. Step 4: Simplify right side
    321.24x = 124,085.14
  5. Step 5: Solve for x
    x = 124,085.14/321.24
  6. Step 6: Final answer
    x = 386.27

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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.