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Finding the Fourth Proportional to 667.74, 1,001.46 and 320.86

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Solution

The fourth proportional to 667.74, 1,001.46 and 320.86 is: 481.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.74 : 1,001.46 = 320.86 : x
  2. Step 2: Convert to fraction form
    667.74/1,001.46 = 320.86/x
  3. Step 3: Cross multiply
    667.74x = 1,001.46 × 320.86
  4. Step 4: Simplify right side
    667.74x = 321,330.91
  5. Step 5: Solve for x
    x = 321,330.91/667.74
  6. Step 6: Final answer
    x = 481.22

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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.