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Finding the Fourth Proportional to 994.28, 1,372.56 and 645.17

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Solution

The fourth proportional to 994.28, 1,372.56 and 645.17 is: 890.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.28 : 1,372.56 = 645.17 : x
  2. Step 2: Convert to fraction form
    994.28/1,372.56 = 645.17/x
  3. Step 3: Cross multiply
    994.28x = 1,372.56 × 645.17
  4. Step 4: Simplify right side
    994.28x = 885,534.54
  5. Step 5: Solve for x
    x = 885,534.54/994.28
  6. Step 6: Final answer
    x = 890.63

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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.