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Finding the Fourth Proportional to 81,963.60, 122,772.60 and 68,139.60

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Solution

The fourth proportional to 81,963.60, 122,772.60 and 68,139.60 is: 102,065.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,963.60 : 122,772.60 = 68,139.60 : x
  2. Step 2: Convert to fraction form
    81,963.60/122,772.60 = 68,139.60/x
  3. Step 3: Cross multiply
    81,963.60x = 122,772.60 × 68,139.60
  4. Step 4: Simplify right side
    81,963.60x = 8,365,675,854.96
  5. Step 5: Solve for x
    x = 8,365,675,854.96/81,963.60
  6. Step 6: Final answer
    x = 102,065.74

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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.