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Finding the Fourth Proportional to 994.44, 1,372.05 and 621.80

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Solution

The fourth proportional to 994.44, 1,372.05 and 621.80 is: 857.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.44 : 1,372.05 = 621.80 : x
  2. Step 2: Convert to fraction form
    994.44/1,372.05 = 621.80/x
  3. Step 3: Cross multiply
    994.44x = 1,372.05 × 621.80
  4. Step 4: Simplify right side
    994.44x = 853,140.69
  5. Step 5: Solve for x
    x = 853,140.69/994.44
  6. Step 6: Final answer
    x = 857.91

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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.