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Finding the Fourth Proportional to 641,912.22, 885,866.31 and 355,432.05

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Solution

The fourth proportional to 641,912.22, 885,866.31 and 355,432.05 is: 490,511.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,912.22 : 885,866.31 = 355,432.05 : x
  2. Step 2: Convert to fraction form
    641,912.22/885,866.31 = 355,432.05/x
  3. Step 3: Cross multiply
    641,912.22x = 885,866.31 × 355,432.05
  4. Step 4: Simplify right side
    641,912.22x = 314,865,278,589.24
  5. Step 5: Solve for x
    x = 314,865,278,589.24/641,912.22
  6. Step 6: Final answer
    x = 490,511.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.