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Finding the Fourth Proportional to 128,568.52, 177,422.82 and 71,979.88

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Solution

The fourth proportional to 128,568.52, 177,422.82 and 71,979.88 is: 99,331.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,568.52 : 177,422.82 = 71,979.88 : x
  2. Step 2: Convert to fraction form
    128,568.52/177,422.82 = 71,979.88/x
  3. Step 3: Cross multiply
    128,568.52x = 177,422.82 × 71,979.88
  4. Step 4: Simplify right side
    128,568.52x = 12,770,873,292.86
  5. Step 5: Solve for x
    x = 12,770,873,292.86/128,568.52
  6. Step 6: Final answer
    x = 99,331.26

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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.