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Finding the Fourth Proportional to 81,193,123.80, 121,789,685.70 and 78,801,639.30

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Solution

The fourth proportional to 81,193,123.80, 121,789,685.70 and 78,801,639.30 is: 118,202,458.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,193,123.80 : 121,789,685.70 = 78,801,639.30 : x
  2. Step 2: Convert to fraction form
    81,193,123.80/121,789,685.70 = 78,801,639.30/x
  3. Step 3: Cross multiply
    81,193,123.80x = 121,789,685.70 × 78,801,639.30
  4. Step 4: Simplify right side
    81,193,123.80x = 9,597,226,882,991,768
  5. Step 5: Solve for x
    x = 9,597,226,882,991,768/81,193,123.80
  6. Step 6: Final answer
    x = 118,202,458.95

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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.