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Finding the Fourth Proportional to 984.82, 1,356.69 and 673.78

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Solution

The fourth proportional to 984.82, 1,356.69 and 673.78 is: 928.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.82 : 1,356.69 = 673.78 : x
  2. Step 2: Convert to fraction form
    984.82/1,356.69 = 673.78/x
  3. Step 3: Cross multiply
    984.82x = 1,356.69 × 673.78
  4. Step 4: Simplify right side
    984.82x = 914,110.59
  5. Step 5: Solve for x
    x = 914,110.59/984.82
  6. Step 6: Final answer
    x = 928.20

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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.