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Finding the Fourth Proportional to 680.82, 937.89 and 639.06

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Solution

The fourth proportional to 680.82, 937.89 and 639.06 is: 880.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.82 : 937.89 = 639.06 : x
  2. Step 2: Convert to fraction form
    680.82/937.89 = 639.06/x
  3. Step 3: Cross multiply
    680.82x = 937.89 × 639.06
  4. Step 4: Simplify right side
    680.82x = 599,367.98
  5. Step 5: Solve for x
    x = 599,367.98/680.82
  6. Step 6: Final answer
    x = 880.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.