Home / 781,405.20-1,172,107.80-639,687.60

Finding the Fourth Proportional to 781,405.20, 1,172,107.80 and 639,687.60

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Solution

The fourth proportional to 781,405.20, 1,172,107.80 and 639,687.60 is: 959,531.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    781,405.20 : 1,172,107.80 = 639,687.60 : x
  2. Step 2: Convert to fraction form
    781,405.20/1,172,107.80 = 639,687.60/x
  3. Step 3: Cross multiply
    781,405.20x = 1,172,107.80 × 639,687.60
  4. Step 4: Simplify right side
    781,405.20x = 749,782,825,523.28
  5. Step 5: Solve for x
    x = 749,782,825,523.28/781,405.20
  6. Step 6: Final answer
    x = 959,531.40

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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.