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Finding the Fourth Proportional to 100,243.86, 138,334.41 and 54,919.64

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Solution

The fourth proportional to 100,243.86, 138,334.41 and 54,919.64 is: 75,787.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,243.86 : 138,334.41 = 54,919.64 : x
  2. Step 2: Convert to fraction form
    100,243.86/138,334.41 = 54,919.64/x
  3. Step 3: Cross multiply
    100,243.86x = 138,334.41 × 54,919.64
  4. Step 4: Simplify right side
    100,243.86x = 7,597,275,305.14
  5. Step 5: Solve for x
    x = 7,597,275,305.14/100,243.86
  6. Step 6: Final answer
    x = 75,787.94

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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.