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Finding the Fourth Proportional to 100,680.94, 138,940.23 and 55,361.85

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Solution

The fourth proportional to 100,680.94, 138,940.23 and 55,361.85 is: 76,399.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,680.94 : 138,940.23 = 55,361.85 : x
  2. Step 2: Convert to fraction form
    100,680.94/138,940.23 = 55,361.85/x
  3. Step 3: Cross multiply
    100,680.94x = 138,940.23 × 55,361.85
  4. Step 4: Simplify right side
    100,680.94x = 7,691,988,172.23
  5. Step 5: Solve for x
    x = 7,691,988,172.23/100,680.94
  6. Step 6: Final answer
    x = 76,399.65

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1.5x scale

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.