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Finding the Fourth Proportional to 139,968,019.20, 209,952,028.80 and 120,820,396.80

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Solution

The fourth proportional to 139,968,019.20, 209,952,028.80 and 120,820,396.80 is: 181,230,595.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,019.20 : 209,952,028.80 = 120,820,396.80 : x
  2. Step 2: Convert to fraction form
    139,968,019.20/209,952,028.80 = 120,820,396.80/x
  3. Step 3: Cross multiply
    139,968,019.20x = 209,952,028.80 × 120,820,396.80
  4. Step 4: Simplify right side
    139,968,019.20x = 25,366,487,428,581,028
  5. Step 5: Solve for x
    x = 25,366,487,428,581,028/139,968,019.20
  6. Step 6: Final answer
    x = 181,230,595.20

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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.