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Finding the Fourth Proportional to 668.48, 1,003.25 and 394.80

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Solution

The fourth proportional to 668.48, 1,003.25 and 394.80 is: 592.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.48 : 1,003.25 = 394.80 : x
  2. Step 2: Convert to fraction form
    668.48/1,003.25 = 394.80/x
  3. Step 3: Cross multiply
    668.48x = 1,003.25 × 394.80
  4. Step 4: Simplify right side
    668.48x = 396,085.97
  5. Step 5: Solve for x
    x = 396,085.97/668.48
  6. Step 6: Final answer
    x = 592.52

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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.