Home / 128,788.20-193,700.70-115,309.80

Finding the Fourth Proportional to 128,788.20, 193,700.70 and 115,309.80

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Solution

The fourth proportional to 128,788.20, 193,700.70 and 115,309.80 is: 173,428.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,788.20 : 193,700.70 = 115,309.80 : x
  2. Step 2: Convert to fraction form
    128,788.20/193,700.70 = 115,309.80/x
  3. Step 3: Cross multiply
    128,788.20x = 193,700.70 × 115,309.80
  4. Step 4: Simplify right side
    128,788.20x = 22,335,588,976.86
  5. Step 5: Solve for x
    x = 22,335,588,976.86/128,788.20
  6. Step 6: Final answer
    x = 173,428.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.