Home / 128,406.97-177,200.66-71,818.35

Finding the Fourth Proportional to 128,406.97, 177,200.66 and 71,818.35

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Solution

The fourth proportional to 128,406.97, 177,200.66 and 71,818.35 is: 99,108.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,406.97 : 177,200.66 = 71,818.35 : x
  2. Step 2: Convert to fraction form
    128,406.97/177,200.66 = 71,818.35/x
  3. Step 3: Cross multiply
    128,406.97x = 177,200.66 × 71,818.35
  4. Step 4: Simplify right side
    128,406.97x = 12,726,257,775.02
  5. Step 5: Solve for x
    x = 12,726,257,775.02/128,406.97
  6. Step 6: Final answer
    x = 99,108.78

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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.