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Finding the Fourth Proportional to 994.45, 1,372.21 and 552.31

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Solution

The fourth proportional to 994.45, 1,372.21 and 552.31 is: 762.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.45 : 1,372.21 = 552.31 : x
  2. Step 2: Convert to fraction form
    994.45/1,372.21 = 552.31/x
  3. Step 3: Cross multiply
    994.45x = 1,372.21 × 552.31
  4. Step 4: Simplify right side
    994.45x = 757,885.31
  5. Step 5: Solve for x
    x = 757,885.31/994.45
  6. Step 6: Final answer
    x = 762.12

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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.