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Finding the Fourth Proportional to 128,843.92, 178,995.10 and 127,690.48

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Solution

The fourth proportional to 128,843.92, 178,995.10 and 127,690.48 is: 177,392.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,843.92 : 178,995.10 = 127,690.48 : x
  2. Step 2: Convert to fraction form
    128,843.92/178,995.10 = 127,690.48/x
  3. Step 3: Cross multiply
    128,843.92x = 178,995.10 × 127,690.48
  4. Step 4: Simplify right side
    128,843.92x = 22,855,970,236.65
  5. Step 5: Solve for x
    x = 22,855,970,236.65/128,843.92
  6. Step 6: Final answer
    x = 177,392.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.