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Finding the Fourth Proportional to 81,947.60, 122,791.80 and 68,728.40

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Solution

The fourth proportional to 81,947.60, 122,791.80 and 68,728.40 is: 102,983.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,947.60 : 122,791.80 = 68,728.40 : x
  2. Step 2: Convert to fraction form
    81,947.60/122,791.80 = 68,728.40/x
  3. Step 3: Cross multiply
    81,947.60x = 122,791.80 × 68,728.40
  4. Step 4: Simplify right side
    81,947.60x = 8,439,283,947.12
  5. Step 5: Solve for x
    x = 8,439,283,947.12/81,947.60
  6. Step 6: Final answer
    x = 102,983.91

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1.5x scale

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.