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Finding the Fourth Proportional to 668.06, 1,001.75 and 321.39

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Solution

The fourth proportional to 668.06, 1,001.75 and 321.39 is: 481.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.06 : 1,001.75 = 321.39 : x
  2. Step 2: Convert to fraction form
    668.06/1,001.75 = 321.39/x
  3. Step 3: Cross multiply
    668.06x = 1,001.75 × 321.39
  4. Step 4: Simplify right side
    668.06x = 321,948.43
  5. Step 5: Solve for x
    x = 321,948.43/668.06
  6. Step 6: Final answer
    x = 481.92

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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.