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Finding the Fourth Proportional to 886.14, 1,221.68 and 620.22

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Solution

The fourth proportional to 886.14, 1,221.68 and 620.22 is: 855.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.14 : 1,221.68 = 620.22 : x
  2. Step 2: Convert to fraction form
    886.14/1,221.68 = 620.22/x
  3. Step 3: Cross multiply
    886.14x = 1,221.68 × 620.22
  4. Step 4: Simplify right side
    886.14x = 757,710.37
  5. Step 5: Solve for x
    x = 757,710.37/886.14
  6. Step 6: Final answer
    x = 855.07

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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.