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Finding the Fourth Proportional to 994.66, 1,372.89 and 621.42

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Solution

The fourth proportional to 994.66, 1,372.89 and 621.42 is: 857.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.66 : 1,372.89 = 621.42 : x
  2. Step 2: Convert to fraction form
    994.66/1,372.89 = 621.42/x
  3. Step 3: Cross multiply
    994.66x = 1,372.89 × 621.42
  4. Step 4: Simplify right side
    994.66x = 853,138.49
  5. Step 5: Solve for x
    x = 853,138.49/994.66
  6. Step 6: Final answer
    x = 857.72

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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.