Home / 128,858.16-177,830.25-80,488.73

Finding the Fourth Proportional to 128,858.16, 177,830.25 and 80,488.73

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Solution

The fourth proportional to 128,858.16, 177,830.25 and 80,488.73 is: 111,078.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,858.16 : 177,830.25 = 80,488.73 : x
  2. Step 2: Convert to fraction form
    128,858.16/177,830.25 = 80,488.73/x
  3. Step 3: Cross multiply
    128,858.16x = 177,830.25 × 80,488.73
  4. Step 4: Simplify right side
    128,858.16x = 14,313,330,634.12
  5. Step 5: Solve for x
    x = 14,313,330,634.12/128,858.16
  6. Step 6: Final answer
    x = 111,078.18

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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.