Home / 128,481.20-177,309-71,891.36

Finding the Fourth Proportional to 128,481.20, 177,309 and 71,891.36

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Solution

The fourth proportional to 128,481.20, 177,309 and 71,891.36 is: 99,212.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,481.20 : 177,309 = 71,891.36 : x
  2. Step 2: Convert to fraction form
    128,481.20/177,309 = 71,891.36/x
  3. Step 3: Cross multiply
    128,481.20x = 177,309 × 71,891.36
  4. Step 4: Simplify right side
    128,481.20x = 12,746,985,150.24
  5. Step 5: Solve for x
    x = 12,746,985,150.24/128,481.20
  6. Step 6: Final answer
    x = 99,212.84

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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.