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Finding the Fourth Proportional to 399,298.61, 551,033.08 and 218,012.11

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Solution

The fourth proportional to 399,298.61, 551,033.08 and 218,012.11 is: 300,857.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,298.61 : 551,033.08 = 218,012.11 : x
  2. Step 2: Convert to fraction form
    399,298.61/551,033.08 = 218,012.11/x
  3. Step 3: Cross multiply
    399,298.61x = 551,033.08 × 218,012.11
  4. Step 4: Simplify right side
    399,298.61x = 120,131,882,527.99
  5. Step 5: Solve for x
    x = 120,131,882,527.99/399,298.61
  6. Step 6: Final answer
    x = 300,857.25

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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.