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Finding the Fourth Proportional to 884.20, 1,220.79 and 790.65

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Solution

The fourth proportional to 884.20, 1,220.79 and 790.65 is: 1,091.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.20 : 1,220.79 = 790.65 : x
  2. Step 2: Convert to fraction form
    884.20/1,220.79 = 790.65/x
  3. Step 3: Cross multiply
    884.20x = 1,220.79 × 790.65
  4. Step 4: Simplify right side
    884.20x = 965,217.61
  5. Step 5: Solve for x
    x = 965,217.61/884.20
  6. Step 6: Final answer
    x = 1,091.63

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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.