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Finding the Fourth Proportional to 139,969,337.80, 209,954,006.70 and 71,818,918.60

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Solution

The fourth proportional to 139,969,337.80, 209,954,006.70 and 71,818,918.60 is: 107,728,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,337.80 : 209,954,006.70 = 71,818,918.60 : x
  2. Step 2: Convert to fraction form
    139,969,337.80/209,954,006.70 = 71,818,918.60/x
  3. Step 3: Cross multiply
    139,969,337.80x = 209,954,006.70 × 71,818,918.60
  4. Step 4: Simplify right side
    139,969,337.80x = 15,078,669,716,931,152
  5. Step 5: Solve for x
    x = 15,078,669,716,931,152/139,969,337.80
  6. Step 6: Final answer
    x = 107,728,377.90

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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.