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Finding the Fourth Proportional to 668.98, 1,003.17 and 257.80

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Solution

The fourth proportional to 668.98, 1,003.17 and 257.80 is: 386.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.98 : 1,003.17 = 257.80 : x
  2. Step 2: Convert to fraction form
    668.98/1,003.17 = 257.80/x
  3. Step 3: Cross multiply
    668.98x = 1,003.17 × 257.80
  4. Step 4: Simplify right side
    668.98x = 258,617.23
  5. Step 5: Solve for x
    x = 258,617.23/668.98
  6. Step 6: Final answer
    x = 386.58

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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.