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Finding the Fourth Proportional to 994.78, 1,372.79 and 552.68

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Solution

The fourth proportional to 994.78, 1,372.79 and 552.68 is: 762.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.78 : 1,372.79 = 552.68 : x
  2. Step 2: Convert to fraction form
    994.78/1,372.79 = 552.68/x
  3. Step 3: Cross multiply
    994.78x = 1,372.79 × 552.68
  4. Step 4: Simplify right side
    994.78x = 758,713.58
  5. Step 5: Solve for x
    x = 758,713.58/994.78
  6. Step 6: Final answer
    x = 762.69

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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.