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Finding the Fourth Proportional to 494.88, 742.22 and 321.42

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Solution

The fourth proportional to 494.88, 742.22 and 321.42 is: 482.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.88 : 742.22 = 321.42 : x
  2. Step 2: Convert to fraction form
    494.88/742.22 = 321.42/x
  3. Step 3: Cross multiply
    494.88x = 742.22 × 321.42
  4. Step 4: Simplify right side
    494.88x = 238,564.35
  5. Step 5: Solve for x
    x = 238,564.35/494.88
  6. Step 6: Final answer
    x = 482.07

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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.