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Finding the Fourth Proportional to 668.81, 1,003.21 and 181.86

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Solution

The fourth proportional to 668.81, 1,003.21 and 181.86 is: 272.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.81 : 1,003.21 = 181.86 : x
  2. Step 2: Convert to fraction form
    668.81/1,003.21 = 181.86/x
  3. Step 3: Cross multiply
    668.81x = 1,003.21 × 181.86
  4. Step 4: Simplify right side
    668.81x = 182,439.55
  5. Step 5: Solve for x
    x = 182,439.55/668.81
  6. Step 6: Final answer
    x = 272.78

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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.