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Finding the Fourth Proportional to 128,708.34, 177,704.01 and 80,383.74

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Solution

The fourth proportional to 128,708.34, 177,704.01 and 80,383.74 is: 110,983.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.34 : 177,704.01 = 80,383.74 : x
  2. Step 2: Convert to fraction form
    128,708.34/177,704.01 = 80,383.74/x
  3. Step 3: Cross multiply
    128,708.34x = 177,704.01 × 80,383.74
  4. Step 4: Simplify right side
    128,708.34x = 14,284,512,936.80
  5. Step 5: Solve for x
    x = 14,284,512,936.80/128,708.34
  6. Step 6: Final answer
    x = 110,983.58

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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.