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Finding the Fourth Proportional to 478.35, 658.91 and 338.22

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Solution

The fourth proportional to 478.35, 658.91 and 338.22 is: 465.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.35 : 658.91 = 338.22 : x
  2. Step 2: Convert to fraction form
    478.35/658.91 = 338.22/x
  3. Step 3: Cross multiply
    478.35x = 658.91 × 338.22
  4. Step 4: Simplify right side
    478.35x = 222,857.39
  5. Step 5: Solve for x
    x = 222,857.39/478.35
  6. Step 6: Final answer
    x = 465.89

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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.