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Finding the Fourth Proportional to 986.52, 1,361.52 and 636.96

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Solution

The fourth proportional to 986.52, 1,361.52 and 636.96 is: 879.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.52 : 1,361.52 = 636.96 : x
  2. Step 2: Convert to fraction form
    986.52/1,361.52 = 636.96/x
  3. Step 3: Cross multiply
    986.52x = 1,361.52 × 636.96
  4. Step 4: Simplify right side
    986.52x = 867,233.78
  5. Step 5: Solve for x
    x = 867,233.78/986.52
  6. Step 6: Final answer
    x = 879.08

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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.