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Finding the Fourth Proportional to 986.13, 1,360.99 and 636.75

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Solution

The fourth proportional to 986.13, 1,360.99 and 636.75 is: 878.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.13 : 1,360.99 = 636.75 : x
  2. Step 2: Convert to fraction form
    986.13/1,360.99 = 636.75/x
  3. Step 3: Cross multiply
    986.13x = 1,360.99 × 636.75
  4. Step 4: Simplify right side
    986.13x = 866,610.38
  5. Step 5: Solve for x
    x = 866,610.38/986.13
  6. Step 6: Final answer
    x = 878.80

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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.