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Finding the Fourth Proportional to 643,997.33, 888,720.28 and 353,621.44

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Solution

The fourth proportional to 643,997.33, 888,720.28 and 353,621.44 is: 487,999.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,997.33 : 888,720.28 = 353,621.44 : x
  2. Step 2: Convert to fraction form
    643,997.33/888,720.28 = 353,621.44/x
  3. Step 3: Cross multiply
    643,997.33x = 888,720.28 × 353,621.44
  4. Step 4: Simplify right side
    643,997.33x = 314,270,542,064.95
  5. Step 5: Solve for x
    x = 314,270,542,064.95/643,997.33
  6. Step 6: Final answer
    x = 487,999.76

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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.