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Finding the Fourth Proportional to 139,410,636.80, 209,115,955.20 and 48,504,012.80

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Solution

The fourth proportional to 139,410,636.80, 209,115,955.20 and 48,504,012.80 is: 72,756,019.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,410,636.80 : 209,115,955.20 = 48,504,012.80 : x
  2. Step 2: Convert to fraction form
    139,410,636.80/209,115,955.20 = 48,504,012.80/x
  3. Step 3: Cross multiply
    139,410,636.80x = 209,115,955.20 × 48,504,012.80
  4. Step 4: Simplify right side
    139,410,636.80x = 10,142,962,967,705,026
  5. Step 5: Solve for x
    x = 10,142,962,967,705,026/139,410,636.80
  6. Step 6: Final answer
    x = 72,756,019.20

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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.