Home / 128,515.19-177,340.32-76,831.11

Finding the Fourth Proportional to 128,515.19, 177,340.32 and 76,831.11

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Solution

The fourth proportional to 128,515.19, 177,340.32 and 76,831.11 is: 106,020.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,515.19 : 177,340.32 = 76,831.11 : x
  2. Step 2: Convert to fraction form
    128,515.19/177,340.32 = 76,831.11/x
  3. Step 3: Cross multiply
    128,515.19x = 177,340.32 × 76,831.11
  4. Step 4: Simplify right side
    128,515.19x = 13,625,253,633.36
  5. Step 5: Solve for x
    x = 13,625,253,633.36/128,515.19
  6. Step 6: Final answer
    x = 106,020.57

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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.