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Finding the Fourth Proportional to 279,147.69, 418,721.54 and 68,785.65

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Solution

The fourth proportional to 279,147.69, 418,721.54 and 68,785.65 is: 103,178.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,147.69 : 418,721.54 = 68,785.65 : x
  2. Step 2: Convert to fraction form
    279,147.69/418,721.54 = 68,785.65/x
  3. Step 3: Cross multiply
    279,147.69x = 418,721.54 × 68,785.65
  4. Step 4: Simplify right side
    279,147.69x = 28,802,032,953.97
  5. Step 5: Solve for x
    x = 28,802,032,953.97/279,147.69
  6. Step 6: Final answer
    x = 103,178.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.