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Finding the Fourth Proportional to 128,873.28, 177,864.54 and 78,601.44

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Solution

The fourth proportional to 128,873.28, 177,864.54 and 78,601.44 is: 108,481.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,873.28 : 177,864.54 = 78,601.44 : x
  2. Step 2: Convert to fraction form
    128,873.28/177,864.54 = 78,601.44/x
  3. Step 3: Cross multiply
    128,873.28x = 177,864.54 × 78,601.44
  4. Step 4: Simplify right side
    128,873.28x = 13,980,408,968.94
  5. Step 5: Solve for x
    x = 13,980,408,968.94/128,873.28
  6. Step 6: Final answer
    x = 108,481.83

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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.