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Finding the Fourth Proportional to 668.88, 1,003.17 and 257.87

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Solution

The fourth proportional to 668.88, 1,003.17 and 257.87 is: 386.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.88 : 1,003.17 = 257.87 : x
  2. Step 2: Convert to fraction form
    668.88/1,003.17 = 257.87/x
  3. Step 3: Cross multiply
    668.88x = 1,003.17 × 257.87
  4. Step 4: Simplify right side
    668.88x = 258,687.45
  5. Step 5: Solve for x
    x = 258,687.45/668.88
  6. Step 6: Final answer
    x = 386.75

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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.