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Finding the Fourth Proportional to 694.08, 1,041.09 and 639.39

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Solution

The fourth proportional to 694.08, 1,041.09 and 639.39 is: 959.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.08 : 1,041.09 = 639.39 : x
  2. Step 2: Convert to fraction form
    694.08/1,041.09 = 639.39/x
  3. Step 3: Cross multiply
    694.08x = 1,041.09 × 639.39
  4. Step 4: Simplify right side
    694.08x = 665,662.54
  5. Step 5: Solve for x
    x = 665,662.54/694.08
  6. Step 6: Final answer
    x = 959.06

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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.