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Finding the Fourth Proportional to 399,884.69, 551,841.96 and 218,598.78

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Solution

The fourth proportional to 399,884.69, 551,841.96 and 218,598.78 is: 301,666.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,884.69 : 551,841.96 = 218,598.78 : x
  2. Step 2: Convert to fraction form
    399,884.69/551,841.96 = 218,598.78/x
  3. Step 3: Cross multiply
    399,884.69x = 551,841.96 × 218,598.78
  4. Step 4: Simplify right side
    399,884.69x = 120,631,979,208.81
  5. Step 5: Solve for x
    x = 120,631,979,208.81/399,884.69
  6. Step 6: Final answer
    x = 301,666.91

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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.