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Finding the Fourth Proportional to 128,859.16, 177,831.63 and 80,489.73

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Solution

The fourth proportional to 128,859.16, 177,831.63 and 80,489.73 is: 111,079.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,859.16 : 177,831.63 = 80,489.73 : x
  2. Step 2: Convert to fraction form
    128,859.16/177,831.63 = 80,489.73/x
  3. Step 3: Cross multiply
    128,859.16x = 177,831.63 × 80,489.73
  4. Step 4: Simplify right side
    128,859.16x = 14,313,619,884.16
  5. Step 5: Solve for x
    x = 14,313,619,884.16/128,859.16
  6. Step 6: Final answer
    x = 111,079.57

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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.