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Finding the Fourth Proportional to 81,382.52, 121,996.80 and 61,360.92

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Solution

The fourth proportional to 81,382.52, 121,996.80 and 61,360.92 is: 91,983.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,382.52 : 121,996.80 = 61,360.92 : x
  2. Step 2: Convert to fraction form
    81,382.52/121,996.80 = 61,360.92/x
  3. Step 3: Cross multiply
    81,382.52x = 121,996.80 × 61,360.92
  4. Step 4: Simplify right side
    81,382.52x = 7,485,835,885.06
  5. Step 5: Solve for x
    x = 7,485,835,885.06/81,382.52
  6. Step 6: Final answer
    x = 91,983.34

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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.