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Finding the Fourth Proportional to 67,086.93, 100,128.03 and 65,979.66

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Solution

The fourth proportional to 67,086.93, 100,128.03 and 65,979.66 is: 98,475.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,086.93 : 100,128.03 = 65,979.66 : x
  2. Step 2: Convert to fraction form
    67,086.93/100,128.03 = 65,979.66/x
  3. Step 3: Cross multiply
    67,086.93x = 100,128.03 × 65,979.66
  4. Step 4: Simplify right side
    67,086.93x = 6,606,413,375.87
  5. Step 5: Solve for x
    x = 6,606,413,375.87/67,086.93
  6. Step 6: Final answer
    x = 98,475.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.