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Finding the Fourth Proportional to 81,275.77, 121,961.81 and 36,901.86

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Solution

The fourth proportional to 81,275.77, 121,961.81 and 36,901.86 is: 55,374.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,275.77 : 121,961.81 = 36,901.86 : x
  2. Step 2: Convert to fraction form
    81,275.77/121,961.81 = 36,901.86/x
  3. Step 3: Cross multiply
    81,275.77x = 121,961.81 × 36,901.86
  4. Step 4: Simplify right side
    81,275.77x = 4,500,617,637.97
  5. Step 5: Solve for x
    x = 4,500,617,637.97/81,275.77
  6. Step 6: Final answer
    x = 55,374.65

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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.