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Finding the Fourth Proportional to 668.74, 1,003.36 and 326.50

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Solution

The fourth proportional to 668.74, 1,003.36 and 326.50 is: 489.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.74 : 1,003.36 = 326.50 : x
  2. Step 2: Convert to fraction form
    668.74/1,003.36 = 326.50/x
  3. Step 3: Cross multiply
    668.74x = 1,003.36 × 326.50
  4. Step 4: Simplify right side
    668.74x = 327,597.04
  5. Step 5: Solve for x
    x = 327,597.04/668.74
  6. Step 6: Final answer
    x = 489.87

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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.