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Finding the Fourth Proportional to 319.35, 478.25 and 221.60

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Solution

The fourth proportional to 319.35, 478.25 and 221.60 is: 331.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.35 : 478.25 = 221.60 : x
  2. Step 2: Convert to fraction form
    319.35/478.25 = 221.60/x
  3. Step 3: Cross multiply
    319.35x = 478.25 × 221.60
  4. Step 4: Simplify right side
    319.35x = 105,976.70
  5. Step 5: Solve for x
    x = 105,976.70/319.35
  6. Step 6: Final answer
    x = 331.85

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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.