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Finding the Fourth Proportional to 994.23, 1,372.90 and 621.84

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Solution

The fourth proportional to 994.23, 1,372.90 and 621.84 is: 858.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.23 : 1,372.90 = 621.84 : x
  2. Step 2: Convert to fraction form
    994.23/1,372.90 = 621.84/x
  3. Step 3: Cross multiply
    994.23x = 1,372.90 × 621.84
  4. Step 4: Simplify right side
    994.23x = 853,724.14
  5. Step 5: Solve for x
    x = 853,724.14/994.23
  6. Step 6: Final answer
    x = 858.68

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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.