Home / 128,826-177,719.40-91,121.04

Finding the Fourth Proportional to 128,826, 177,719.40 and 91,121.04

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Solution

The fourth proportional to 128,826, 177,719.40 and 91,121.04 is: 125,704.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,826 : 177,719.40 = 91,121.04 : x
  2. Step 2: Convert to fraction form
    128,826/177,719.40 = 91,121.04/x
  3. Step 3: Cross multiply
    128,826x = 177,719.40 × 91,121.04
  4. Step 4: Simplify right side
    128,826x = 16,193,976,556.18
  5. Step 5: Solve for x
    x = 16,193,976,556.18/128,826
  6. Step 6: Final answer
    x = 125,704.26

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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.