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Finding the Fourth Proportional to 986.36, 1,360.94 and 636.98

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Solution

The fourth proportional to 986.36, 1,360.94 and 636.98 is: 878.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.36 : 1,360.94 = 636.98 : x
  2. Step 2: Convert to fraction form
    986.36/1,360.94 = 636.98/x
  3. Step 3: Cross multiply
    986.36x = 1,360.94 × 636.98
  4. Step 4: Simplify right side
    986.36x = 866,891.56
  5. Step 5: Solve for x
    x = 866,891.56/986.36
  6. Step 6: Final answer
    x = 878.88

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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.