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Finding the Fourth Proportional to 128,796.75, 177,679.04 and 91,091.79

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Solution

The fourth proportional to 128,796.75, 177,679.04 and 91,091.79 is: 125,663.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,796.75 : 177,679.04 = 91,091.79 : x
  2. Step 2: Convert to fraction form
    128,796.75/177,679.04 = 91,091.79/x
  3. Step 3: Cross multiply
    128,796.75x = 177,679.04 × 91,091.79
  4. Step 4: Simplify right side
    128,796.75x = 16,185,101,343.62
  5. Step 5: Solve for x
    x = 16,185,101,343.62/128,796.75
  6. Step 6: Final answer
    x = 125,663.90

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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.