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Finding the Fourth Proportional to 100,379.34, 138,523.69 and 55,057.70

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Solution

The fourth proportional to 100,379.34, 138,523.69 and 55,057.70 is: 75,979.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,379.34 : 138,523.69 = 55,057.70 : x
  2. Step 2: Convert to fraction form
    100,379.34/138,523.69 = 55,057.70/x
  3. Step 3: Cross multiply
    100,379.34x = 138,523.69 × 55,057.70
  4. Step 4: Simplify right side
    100,379.34x = 7,626,795,074.29
  5. Step 5: Solve for x
    x = 7,626,795,074.29/100,379.34
  6. Step 6: Final answer
    x = 75,979.73

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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.