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Finding the Fourth Proportional to 986.75, 1,362.21 and 613.85

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Solution

The fourth proportional to 986.75, 1,362.21 and 613.85 is: 847.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.75 : 1,362.21 = 613.85 : x
  2. Step 2: Convert to fraction form
    986.75/1,362.21 = 613.85/x
  3. Step 3: Cross multiply
    986.75x = 1,362.21 × 613.85
  4. Step 4: Simplify right side
    986.75x = 836,192.61
  5. Step 5: Solve for x
    x = 836,192.61/986.75
  6. Step 6: Final answer
    x = 847.42

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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.