Home / 128,863.20-178,001.55-107,422.98

Finding the Fourth Proportional to 128,863.20, 178,001.55 and 107,422.98

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Solution

The fourth proportional to 128,863.20, 178,001.55 and 107,422.98 is: 148,385.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,863.20 : 178,001.55 = 107,422.98 : x
  2. Step 2: Convert to fraction form
    128,863.20/178,001.55 = 107,422.98/x
  3. Step 3: Cross multiply
    128,863.20x = 178,001.55 × 107,422.98
  4. Step 4: Simplify right side
    128,863.20x = 19,121,456,945.62
  5. Step 5: Solve for x
    x = 19,121,456,945.62/128,863.20
  6. Step 6: Final answer
    x = 148,385.71

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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.