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Finding the Fourth Proportional to 139,968,563.20, 209,952,844.80 and 120,820,940.80

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Solution

The fourth proportional to 139,968,563.20, 209,952,844.80 and 120,820,940.80 is: 181,231,411.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,563.20 : 209,952,844.80 = 120,820,940.80 : x
  2. Step 2: Convert to fraction form
    139,968,563.20/209,952,844.80 = 120,820,940.80/x
  3. Step 3: Cross multiply
    139,968,563.20x = 209,952,844.80 × 120,820,940.80
  4. Step 4: Simplify right side
    139,968,563.20x = 25,366,700,232,372,388
  5. Step 5: Solve for x
    x = 25,366,700,232,372,388/139,968,563.20
  6. Step 6: Final answer
    x = 181,231,411.20

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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.