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Finding the Fourth Proportional to 399,636.39, 551,491.79 and 218,344.43

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Solution

The fourth proportional to 399,636.39, 551,491.79 and 218,344.43 is: 301,311.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,636.39 : 551,491.79 = 218,344.43 : x
  2. Step 2: Convert to fraction form
    399,636.39/551,491.79 = 218,344.43/x
  3. Step 3: Cross multiply
    399,636.39x = 551,491.79 × 218,344.43
  4. Step 4: Simplify right side
    399,636.39x = 120,415,159,991.37
  5. Step 5: Solve for x
    x = 120,415,159,991.37/399,636.39
  6. Step 6: Final answer
    x = 301,311.80

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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.