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Finding the Fourth Proportional to 911.04, 1,361.89 and 679.78

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Solution

The fourth proportional to 911.04, 1,361.89 and 679.78 is: 1,016.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.04 : 1,361.89 = 679.78 : x
  2. Step 2: Convert to fraction form
    911.04/1,361.89 = 679.78/x
  3. Step 3: Cross multiply
    911.04x = 1,361.89 × 679.78
  4. Step 4: Simplify right side
    911.04x = 925,785.58
  5. Step 5: Solve for x
    x = 925,785.58/911.04
  6. Step 6: Final answer
    x = 1,016.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.