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Finding the Fourth Proportional to 138,293.78, 207,440.67 and 79,087.91

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Solution

The fourth proportional to 138,293.78, 207,440.67 and 79,087.91 is: 118,631.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,293.78 : 207,440.67 = 79,087.91 : x
  2. Step 2: Convert to fraction form
    138,293.78/207,440.67 = 79,087.91/x
  3. Step 3: Cross multiply
    138,293.78x = 207,440.67 × 79,087.91
  4. Step 4: Simplify right side
    138,293.78x = 16,406,049,039.30
  5. Step 5: Solve for x
    x = 16,406,049,039.30/138,293.78
  6. Step 6: Final answer
    x = 118,631.87

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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.