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Finding the Fourth Proportional to 994.74, 1,372.56 and 680.28

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Solution

The fourth proportional to 994.74, 1,372.56 and 680.28 is: 938.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.74 : 1,372.56 = 680.28 : x
  2. Step 2: Convert to fraction form
    994.74/1,372.56 = 680.28/x
  3. Step 3: Cross multiply
    994.74x = 1,372.56 × 680.28
  4. Step 4: Simplify right side
    994.74x = 933,725.12
  5. Step 5: Solve for x
    x = 933,725.12/994.74
  6. Step 6: Final answer
    x = 938.66

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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.