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Finding the Fourth Proportional to 668.63, 1,003.09 and 257.96

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Solution

The fourth proportional to 668.63, 1,003.09 and 257.96 is: 387.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.63 : 1,003.09 = 257.96 : x
  2. Step 2: Convert to fraction form
    668.63/1,003.09 = 257.96/x
  3. Step 3: Cross multiply
    668.63x = 1,003.09 × 257.96
  4. Step 4: Simplify right side
    668.63x = 258,757.10
  5. Step 5: Solve for x
    x = 258,757.10/668.63
  6. Step 6: Final answer
    x = 387.00

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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.