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Finding the Fourth Proportional to 399,678.98, 551,540.54 and 218,397.13

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Solution

The fourth proportional to 399,678.98, 551,540.54 and 218,397.13 is: 301,379.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,678.98 : 551,540.54 = 218,397.13 : x
  2. Step 2: Convert to fraction form
    399,678.98/551,540.54 = 218,397.13/x
  3. Step 3: Cross multiply
    399,678.98x = 551,540.54 × 218,397.13
  4. Step 4: Simplify right side
    399,678.98x = 120,454,870,181.79
  5. Step 5: Solve for x
    x = 120,454,870,181.79/399,678.98
  6. Step 6: Final answer
    x = 301,379.05

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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.