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Finding the Fourth Proportional to 321.79, 443.56 and 279.67

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Solution

The fourth proportional to 321.79, 443.56 and 279.67 is: 385.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.79 : 443.56 = 279.67 : x
  2. Step 2: Convert to fraction form
    321.79/443.56 = 279.67/x
  3. Step 3: Cross multiply
    321.79x = 443.56 × 279.67
  4. Step 4: Simplify right side
    321.79x = 124,050.43
  5. Step 5: Solve for x
    x = 124,050.43/321.79
  6. Step 6: Final answer
    x = 385.50

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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.