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Finding the Fourth Proportional to 91,797.70, 137,696.55 and 81,775.30

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Solution

The fourth proportional to 91,797.70, 137,696.55 and 81,775.30 is: 122,662.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,797.70 : 137,696.55 = 81,775.30 : x
  2. Step 2: Convert to fraction form
    91,797.70/137,696.55 = 81,775.30/x
  3. Step 3: Cross multiply
    91,797.70x = 137,696.55 × 81,775.30
  4. Step 4: Simplify right side
    91,797.70x = 11,260,176,685.22
  5. Step 5: Solve for x
    x = 11,260,176,685.22/91,797.70
  6. Step 6: Final answer
    x = 122,662.95

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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.