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Finding the Fourth Proportional to 100,641.71, 138,882.56 and 57,619.77

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Solution

The fourth proportional to 100,641.71, 138,882.56 and 57,619.77 is: 79,513.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,641.71 : 138,882.56 = 57,619.77 : x
  2. Step 2: Convert to fraction form
    100,641.71/138,882.56 = 57,619.77/x
  3. Step 3: Cross multiply
    100,641.71x = 138,882.56 × 57,619.77
  4. Step 4: Simplify right side
    100,641.71x = 8,002,380,876.11
  5. Step 5: Solve for x
    x = 8,002,380,876.11/100,641.71
  6. Step 6: Final answer
    x = 79,513.57

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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.