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Finding the Fourth Proportional to 373,657.72, 515,512.92 and 287,643

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Solution

The fourth proportional to 373,657.72, 515,512.92 and 287,643 is: 396,843.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    373,657.72 : 515,512.92 = 287,643 : x
  2. Step 2: Convert to fraction form
    373,657.72/515,512.92 = 287,643/x
  3. Step 3: Cross multiply
    373,657.72x = 515,512.92 × 287,643
  4. Step 4: Simplify right side
    373,657.72x = 148,283,682,847.56
  5. Step 5: Solve for x
    x = 148,283,682,847.56/373,657.72
  6. Step 6: Final answer
    x = 396,843.62

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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.