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Finding the Fourth Proportional to 669.27, 1,003.30 and 258.68

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Solution

The fourth proportional to 669.27, 1,003.30 and 258.68 is: 387.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.27 : 1,003.30 = 258.68 : x
  2. Step 2: Convert to fraction form
    669.27/1,003.30 = 258.68/x
  3. Step 3: Cross multiply
    669.27x = 1,003.30 × 258.68
  4. Step 4: Simplify right side
    669.27x = 259,527.33
  5. Step 5: Solve for x
    x = 259,527.33/669.27
  6. Step 6: Final answer
    x = 387.78

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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.