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Finding the Fourth Proportional to 399,805.38, 551,744.19 and 218,513.34

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Solution

The fourth proportional to 399,805.38, 551,744.19 and 218,513.34 is: 301,555.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,805.38 : 551,744.19 = 218,513.34 : x
  2. Step 2: Convert to fraction form
    399,805.38/551,744.19 = 218,513.34/x
  3. Step 3: Cross multiply
    399,805.38x = 551,744.19 × 218,513.34
  4. Step 4: Simplify right side
    399,805.38x = 120,563,465,782.50
  5. Step 5: Solve for x
    x = 120,563,465,782.50/399,805.38
  6. Step 6: Final answer
    x = 301,555.39

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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.