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Finding the Fourth Proportional to 139,410,643.80, 209,115,965.70 and 48,504,019.80

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Solution

The fourth proportional to 139,410,643.80, 209,115,965.70 and 48,504,019.80 is: 72,756,029.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,410,643.80 : 209,115,965.70 = 48,504,019.80 : x
  2. Step 2: Convert to fraction form
    139,410,643.80/209,115,965.70 = 48,504,019.80/x
  3. Step 3: Cross multiply
    139,410,643.80x = 209,115,965.70 × 48,504,019.80
  4. Step 4: Simplify right side
    139,410,643.80x = 10,142,964,940,808,920
  5. Step 5: Solve for x
    x = 10,142,964,940,808,920/139,410,643.80
  6. Step 6: Final answer
    x = 72,756,029.70

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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.