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Finding the Fourth Proportional to 128,249.12, 176,983.30 and 71,660.48

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Solution

The fourth proportional to 128,249.12, 176,983.30 and 71,660.48 is: 98,891.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,249.12 : 176,983.30 = 71,660.48 : x
  2. Step 2: Convert to fraction form
    128,249.12/176,983.30 = 71,660.48/x
  3. Step 3: Cross multiply
    128,249.12x = 176,983.30 × 71,660.48
  4. Step 4: Simplify right side
    128,249.12x = 12,682,708,229.98
  5. Step 5: Solve for x
    x = 12,682,708,229.98/128,249.12
  6. Step 6: Final answer
    x = 98,891.19

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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.