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Finding the Fourth Proportional to 3,979,802.80, 5,969,679.88 and 1,139,920.12

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Solution

The fourth proportional to 3,979,802.80, 5,969,679.88 and 1,139,920.12 is: 1,709,873.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979,802.80 : 5,969,679.88 = 1,139,920.12 : x
  2. Step 2: Convert to fraction form
    3,979,802.80/5,969,679.88 = 1,139,920.12/x
  3. Step 3: Cross multiply
    3,979,802.80x = 5,969,679.88 × 1,139,920.12
  4. Step 4: Simplify right side
    3,979,802.80x = 6,804,958,205,171.19
  5. Step 5: Solve for x
    x = 6,804,958,205,171.19/3,979,802.80
  6. Step 6: Final answer
    x = 1,709,873.21

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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.