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Finding the Fourth Proportional to 399,448.92, 551,215.11 and 218,124

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Solution

The fourth proportional to 399,448.92, 551,215.11 and 218,124 is: 300,997.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,448.92 : 551,215.11 = 218,124 : x
  2. Step 2: Convert to fraction form
    399,448.92/551,215.11 = 218,124/x
  3. Step 3: Cross multiply
    399,448.92x = 551,215.11 × 218,124
  4. Step 4: Simplify right side
    399,448.92x = 120,233,244,653.64
  5. Step 5: Solve for x
    x = 120,233,244,653.64/399,448.92
  6. Step 6: Final answer
    x = 300,997.80

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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.