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Finding the Fourth Proportional to 667.44, 1,001.20 and 320.70

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Solution

The fourth proportional to 667.44, 1,001.20 and 320.70 is: 481.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.44 : 1,001.20 = 320.70 : x
  2. Step 2: Convert to fraction form
    667.44/1,001.20 = 320.70/x
  3. Step 3: Cross multiply
    667.44x = 1,001.20 × 320.70
  4. Step 4: Simplify right side
    667.44x = 321,084.84
  5. Step 5: Solve for x
    x = 321,084.84/667.44
  6. Step 6: Final answer
    x = 481.07

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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.