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Finding the Fourth Proportional to 399,456.28, 551,246.65 and 218,168.29

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Solution

The fourth proportional to 399,456.28, 551,246.65 and 218,168.29 is: 301,070.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,456.28 : 551,246.65 = 218,168.29 : x
  2. Step 2: Convert to fraction form
    399,456.28/551,246.65 = 218,168.29/x
  3. Step 3: Cross multiply
    399,456.28x = 551,246.65 × 218,168.29
  4. Step 4: Simplify right side
    399,456.28x = 120,264,538,998.73
  5. Step 5: Solve for x
    x = 120,264,538,998.73/399,456.28
  6. Step 6: Final answer
    x = 301,070.59

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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.