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Finding the Fourth Proportional to 399,306.30, 551,043.84 and 218,019.79

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Solution

The fourth proportional to 399,306.30, 551,043.84 and 218,019.79 is: 300,867.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,306.30 : 551,043.84 = 218,019.79 : x
  2. Step 2: Convert to fraction form
    399,306.30/551,043.84 = 218,019.79/x
  3. Step 3: Cross multiply
    399,306.30x = 551,043.84 × 218,019.79
  4. Step 4: Simplify right side
    399,306.30x = 120,138,462,277.59
  5. Step 5: Solve for x
    x = 120,138,462,277.59/399,306.30
  6. Step 6: Final answer
    x = 300,867.94

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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.