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Finding the Fourth Proportional to 994.78, 1,372.80 and 552.79

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Solution

The fourth proportional to 994.78, 1,372.80 and 552.79 is: 762.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.78 : 1,372.80 = 552.79 : x
  2. Step 2: Convert to fraction form
    994.78/1,372.80 = 552.79/x
  3. Step 3: Cross multiply
    994.78x = 1,372.80 × 552.79
  4. Step 4: Simplify right side
    994.78x = 758,865.00
  5. Step 5: Solve for x
    x = 758,865.00/994.78
  6. Step 6: Final answer
    x = 762.85

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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.