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Finding the Fourth Proportional to 321.68, 482.70 and 268.22

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Solution

The fourth proportional to 321.68, 482.70 and 268.22 is: 402.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.68 : 482.70 = 268.22 : x
  2. Step 2: Convert to fraction form
    321.68/482.70 = 268.22/x
  3. Step 3: Cross multiply
    321.68x = 482.70 × 268.22
  4. Step 4: Simplify right side
    321.68x = 129,469.79
  5. Step 5: Solve for x
    x = 129,469.79/321.68
  6. Step 6: Final answer
    x = 402.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.