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Finding the Fourth Proportional to 986.92, 1,361.81 and 613.91

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Solution

The fourth proportional to 986.92, 1,361.81 and 613.91 is: 847.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.92 : 1,361.81 = 613.91 : x
  2. Step 2: Convert to fraction form
    986.92/1,361.81 = 613.91/x
  3. Step 3: Cross multiply
    986.92x = 1,361.81 × 613.91
  4. Step 4: Simplify right side
    986.92x = 836,033.72
  5. Step 5: Solve for x
    x = 836,033.72/986.92
  6. Step 6: Final answer
    x = 847.12

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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.