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Finding the Fourth Proportional to 75,138.80, 103,691.76 and 41,147.60

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Solution

The fourth proportional to 75,138.80, 103,691.76 and 41,147.60 is: 56,783.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,138.80 : 103,691.76 = 41,147.60 : x
  2. Step 2: Convert to fraction form
    75,138.80/103,691.76 = 41,147.60/x
  3. Step 3: Cross multiply
    75,138.80x = 103,691.76 × 41,147.60
  4. Step 4: Simplify right side
    75,138.80x = 4,266,667,063.78
  5. Step 5: Solve for x
    x = 4,266,667,063.78/75,138.80
  6. Step 6: Final answer
    x = 56,783.81

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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.