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Finding the Fourth Proportional to 100,679.82, 138,939.75 and 55,359.78

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Solution

The fourth proportional to 100,679.82, 138,939.75 and 55,359.78 is: 76,397.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,679.82 : 138,939.75 = 55,359.78 : x
  2. Step 2: Convert to fraction form
    100,679.82/138,939.75 = 55,359.78/x
  3. Step 3: Cross multiply
    100,679.82x = 138,939.75 × 55,359.78
  4. Step 4: Simplify right side
    100,679.82x = 7,691,673,993.26
  5. Step 5: Solve for x
    x = 7,691,673,993.26/100,679.82
  6. Step 6: Final answer
    x = 76,397.38

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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.