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Finding the Fourth Proportional to 139,449,987.20, 209,174,980.80 and 133,179,420.80

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Solution

The fourth proportional to 139,449,987.20, 209,174,980.80 and 133,179,420.80 is: 199,769,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,449,987.20 : 209,174,980.80 = 133,179,420.80 : x
  2. Step 2: Convert to fraction form
    139,449,987.20/209,174,980.80 = 133,179,420.80/x
  3. Step 3: Cross multiply
    139,449,987.20x = 209,174,980.80 × 133,179,420.80
  4. Step 4: Simplify right side
    139,449,987.20x = 27,857,802,788,795,120
  5. Step 5: Solve for x
    x = 27,857,802,788,795,120/139,449,987.20
  6. Step 6: Final answer
    x = 199,769,131.20

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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.