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Finding the Fourth Proportional to 641,865.82, 885,802.50 and 355,385.90

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Solution

The fourth proportional to 641,865.82, 885,802.50 and 355,385.90 is: 490,447.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,865.82 : 885,802.50 = 355,385.90 : x
  2. Step 2: Convert to fraction form
    641,865.82/885,802.50 = 355,385.90/x
  3. Step 3: Cross multiply
    641,865.82x = 885,802.50 × 355,385.90
  4. Step 4: Simplify right side
    641,865.82x = 314,801,718,684.75
  5. Step 5: Solve for x
    x = 314,801,718,684.75/641,865.82
  6. Step 6: Final answer
    x = 490,447.86

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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.