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Finding the Fourth Proportional to 478,990.43, 661,001.94 and 261,198.56

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Solution

The fourth proportional to 478,990.43, 661,001.94 and 261,198.56 is: 360,451.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,990.43 : 661,001.94 = 261,198.56 : x
  2. Step 2: Convert to fraction form
    478,990.43/661,001.94 = 261,198.56/x
  3. Step 3: Cross multiply
    478,990.43x = 661,001.94 × 261,198.56
  4. Step 4: Simplify right side
    478,990.43x = 172,652,751,580.20
  5. Step 5: Solve for x
    x = 172,652,751,580.20/478,990.43
  6. Step 6: Final answer
    x = 360,451.36

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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.