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Finding the Fourth Proportional to 668.64, 1,003.02 and 394.59

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Solution

The fourth proportional to 668.64, 1,003.02 and 394.59 is: 591.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.64 : 1,003.02 = 394.59 : x
  2. Step 2: Convert to fraction form
    668.64/1,003.02 = 394.59/x
  3. Step 3: Cross multiply
    668.64x = 1,003.02 × 394.59
  4. Step 4: Simplify right side
    668.64x = 395,781.66
  5. Step 5: Solve for x
    x = 395,781.66/668.64
  6. Step 6: Final answer
    x = 591.92

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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.