Home / 128,721.96-177,628.98-75,015.72

Finding the Fourth Proportional to 128,721.96, 177,628.98 and 75,015.72

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Solution

The fourth proportional to 128,721.96, 177,628.98 and 75,015.72 is: 103,517.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,721.96 : 177,628.98 = 75,015.72 : x
  2. Step 2: Convert to fraction form
    128,721.96/177,628.98 = 75,015.72/x
  3. Step 3: Cross multiply
    128,721.96x = 177,628.98 × 75,015.72
  4. Step 4: Simplify right side
    128,721.96x = 13,324,965,827.57
  5. Step 5: Solve for x
    x = 13,324,965,827.57/128,721.96
  6. Step 6: Final answer
    x = 103,517.42

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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.