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Finding the Fourth Proportional to 128,863.56, 177,831.54 and 72,274.44

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Solution

The fourth proportional to 128,863.56, 177,831.54 and 72,274.44 is: 99,738.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,863.56 : 177,831.54 = 72,274.44 : x
  2. Step 2: Convert to fraction form
    128,863.56/177,831.54 = 72,274.44/x
  3. Step 3: Cross multiply
    128,863.56x = 177,831.54 × 72,274.44
  4. Step 4: Simplify right side
    128,863.56x = 12,852,674,967.84
  5. Step 5: Solve for x
    x = 12,852,674,967.84/128,863.56
  6. Step 6: Final answer
    x = 99,738.63

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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.