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Finding the Fourth Proportional to 128,873.43, 177,846.30 and 71,512.97

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Solution

The fourth proportional to 128,873.43, 177,846.30 and 71,512.97 is: 98,688.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,873.43 : 177,846.30 = 71,512.97 : x
  2. Step 2: Convert to fraction form
    128,873.43/177,846.30 = 71,512.97/x
  3. Step 3: Cross multiply
    128,873.43x = 177,846.30 × 71,512.97
  4. Step 4: Simplify right side
    128,873.43x = 12,718,316,227.28
  5. Step 5: Solve for x
    x = 12,718,316,227.28/128,873.43
  6. Step 6: Final answer
    x = 98,688.43

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1.5x scale

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.