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Finding the Fourth Proportional to 1,320,405.20, 1,978,858.20 and 1,169,939.60

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Solution

The fourth proportional to 1,320,405.20, 1,978,858.20 and 1,169,939.60 is: 1,753,359.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320,405.20 : 1,978,858.20 = 1,169,939.60 : x
  2. Step 2: Convert to fraction form
    1,320,405.20/1,978,858.20 = 1,169,939.60/x
  3. Step 3: Cross multiply
    1,320,405.20x = 1,978,858.20 × 1,169,939.60
  4. Step 4: Simplify right side
    1,320,405.20x = 2,315,144,570,964.72
  5. Step 5: Solve for x
    x = 2,315,144,570,964.72/1,320,405.20
  6. Step 6: Final answer
    x = 1,753,359.17

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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.