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Finding the Fourth Proportional to 139,927,310.80, 209,979,439.80 and 82,419,470.80

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Solution

The fourth proportional to 139,927,310.80, 209,979,439.80 and 82,419,470.80 is: 123,681,318.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,927,310.80 : 209,979,439.80 = 82,419,470.80 : x
  2. Step 2: Convert to fraction form
    139,927,310.80/209,979,439.80 = 82,419,470.80/x
  3. Step 3: Cross multiply
    139,927,310.80x = 209,979,439.80 × 82,419,470.80
  4. Step 4: Simplify right side
    139,927,310.80x = 17,306,394,307,196,458
  5. Step 5: Solve for x
    x = 17,306,394,307,196,458/139,927,310.80
  6. Step 6: Final answer
    x = 123,681,318.60

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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.