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Finding the Fourth Proportional to 399,278.73, 551,012.44 and 217,991.13

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Solution

The fourth proportional to 399,278.73, 551,012.44 and 217,991.13 is: 300,832.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,278.73 : 551,012.44 = 217,991.13 : x
  2. Step 2: Convert to fraction form
    399,278.73/551,012.44 = 217,991.13/x
  3. Step 3: Cross multiply
    399,278.73x = 551,012.44 × 217,991.13
  4. Step 4: Simplify right side
    399,278.73x = 120,115,821,684.60
  5. Step 5: Solve for x
    x = 120,115,821,684.60/399,278.73
  6. Step 6: Final answer
    x = 300,832.01

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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.