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Finding the Fourth Proportional to 84,002.88, 125,979.84 and 69,175.20

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Solution

The fourth proportional to 84,002.88, 125,979.84 and 69,175.20 is: 103,742.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,002.88 : 125,979.84 = 69,175.20 : x
  2. Step 2: Convert to fraction form
    84,002.88/125,979.84 = 69,175.20/x
  3. Step 3: Cross multiply
    84,002.88x = 125,979.84 × 69,175.20
  4. Step 4: Simplify right side
    84,002.88x = 8,714,680,627.97
  5. Step 5: Solve for x
    x = 8,714,680,627.97/84,002.88
  6. Step 6: Final answer
    x = 103,742.64

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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.