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Finding the Fourth Proportional to 668.94, 1,003.39 and 206.71

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Solution

The fourth proportional to 668.94, 1,003.39 and 206.71 is: 310.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.94 : 1,003.39 = 206.71 : x
  2. Step 2: Convert to fraction form
    668.94/1,003.39 = 206.71/x
  3. Step 3: Cross multiply
    668.94x = 1,003.39 × 206.71
  4. Step 4: Simplify right side
    668.94x = 207,410.75
  5. Step 5: Solve for x
    x = 207,410.75/668.94
  6. Step 6: Final answer
    x = 310.06

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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.