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Finding the Fourth Proportional to 399,324.98, 551,090.81 and 218,053.76

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Solution

The fourth proportional to 399,324.98, 551,090.81 and 218,053.76 is: 300,926.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,324.98 : 551,090.81 = 218,053.76 : x
  2. Step 2: Convert to fraction form
    399,324.98/551,090.81 = 218,053.76/x
  3. Step 3: Cross multiply
    399,324.98x = 551,090.81 × 218,053.76
  4. Step 4: Simplify right side
    399,324.98x = 120,167,421,011.63
  5. Step 5: Solve for x
    x = 120,167,421,011.63/399,324.98
  6. Step 6: Final answer
    x = 300,926.38

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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.