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Finding the Fourth Proportional to 668.49, 1,002.74 and 206.26

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Solution

The fourth proportional to 668.49, 1,002.74 and 206.26 is: 309.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.49 : 1,002.74 = 206.26 : x
  2. Step 2: Convert to fraction form
    668.49/1,002.74 = 206.26/x
  3. Step 3: Cross multiply
    668.49x = 1,002.74 × 206.26
  4. Step 4: Simplify right side
    668.49x = 206,825.15
  5. Step 5: Solve for x
    x = 206,825.15/668.49
  6. Step 6: Final answer
    x = 309.39

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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.