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Finding the Fourth Proportional to 81,251.51, 121,877.64 and 21,279.86

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Solution

The fourth proportional to 81,251.51, 121,877.64 and 21,279.86 is: 31,919.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,251.51 : 121,877.64 = 21,279.86 : x
  2. Step 2: Convert to fraction form
    81,251.51/121,877.64 = 21,279.86/x
  3. Step 3: Cross multiply
    81,251.51x = 121,877.64 × 21,279.86
  4. Step 4: Simplify right side
    81,251.51x = 2,593,538,506.94
  5. Step 5: Solve for x
    x = 2,593,538,506.94/81,251.51
  6. Step 6: Final answer
    x = 31,919.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.