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Finding the Fourth Proportional to 1,978,640.73, 2,965,955.13 and 781,406.46

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Solution

The fourth proportional to 1,978,640.73, 2,965,955.13 and 781,406.46 is: 1,171,317.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978,640.73 : 2,965,955.13 = 781,406.46 : x
  2. Step 2: Convert to fraction form
    1,978,640.73/2,965,955.13 = 781,406.46/x
  3. Step 3: Cross multiply
    1,978,640.73x = 2,965,955.13 × 781,406.46
  4. Step 4: Simplify right side
    1,978,640.73x = 2,317,616,498,652.14
  5. Step 5: Solve for x
    x = 2,317,616,498,652.14/1,978,640.73
  6. Step 6: Final answer
    x = 1,171,317.49

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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.