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Finding the Fourth Proportional to 399,910.22, 551,889.42 and 218,618.18

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Solution

The fourth proportional to 399,910.22, 551,889.42 and 218,618.18 is: 301,700.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,910.22 : 551,889.42 = 218,618.18 : x
  2. Step 2: Convert to fraction form
    399,910.22/551,889.42 = 218,618.18/x
  3. Step 3: Cross multiply
    399,910.22x = 551,889.42 × 218,618.18
  4. Step 4: Simplify right side
    399,910.22x = 120,653,060,561.66
  5. Step 5: Solve for x
    x = 120,653,060,561.66/399,910.22
  6. Step 6: Final answer
    x = 301,700.37

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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.