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Finding the Fourth Proportional to 399,299.61, 551,034.46 and 218,013.11

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Solution

The fourth proportional to 399,299.61, 551,034.46 and 218,013.11 is: 300,858.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,299.61 : 551,034.46 = 218,013.11 : x
  2. Step 2: Convert to fraction form
    399,299.61/551,034.46 = 218,013.11/x
  3. Step 3: Cross multiply
    399,299.61x = 551,034.46 × 218,013.11
  4. Step 4: Simplify right side
    399,299.61x = 120,132,736,341.77
  5. Step 5: Solve for x
    x = 120,132,736,341.77/399,299.61
  6. Step 6: Final answer
    x = 300,858.64

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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.