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Finding the Fourth Proportional to 640,579.30, 883,999.11 and 354,099.31

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Solution

The fourth proportional to 640,579.30, 883,999.11 and 354,099.31 is: 488,656.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,579.30 : 883,999.11 = 354,099.31 : x
  2. Step 2: Convert to fraction form
    640,579.30/883,999.11 = 354,099.31/x
  3. Step 3: Cross multiply
    640,579.30x = 883,999.11 × 354,099.31
  4. Step 4: Simplify right side
    640,579.30x = 313,023,474,891.61
  5. Step 5: Solve for x
    x = 313,023,474,891.61/640,579.30
  6. Step 6: Final answer
    x = 488,656.87

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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.