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Finding the Fourth Proportional to 886.20, 1,220.84 and 620.14

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Solution

The fourth proportional to 886.20, 1,220.84 and 620.14 is: 854.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.20 : 1,220.84 = 620.14 : x
  2. Step 2: Convert to fraction form
    886.20/1,220.84 = 620.14/x
  3. Step 3: Cross multiply
    886.20x = 1,220.84 × 620.14
  4. Step 4: Simplify right side
    886.20x = 757,091.72
  5. Step 5: Solve for x
    x = 757,091.72/886.20
  6. Step 6: Final answer
    x = 854.31

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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.