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Finding the Fourth Proportional to 128,863.52, 177,831.64 and 72,274.88

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Solution

The fourth proportional to 128,863.52, 177,831.64 and 72,274.88 is: 99,739.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,863.52 : 177,831.64 = 72,274.88 : x
  2. Step 2: Convert to fraction form
    128,863.52/177,831.64 = 72,274.88/x
  3. Step 3: Cross multiply
    128,863.52x = 177,831.64 × 72,274.88
  4. Step 4: Simplify right side
    128,863.52x = 12,852,760,441.20
  5. Step 5: Solve for x
    x = 12,852,760,441.20/128,863.52
  6. Step 6: Final answer
    x = 99,739.32

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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.