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Finding the Fourth Proportional to 128,908.78, 177,926.81 and 88,089.42

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Solution

The fourth proportional to 128,908.78, 177,926.81 and 88,089.42 is: 121,585.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,908.78 : 177,926.81 = 88,089.42 : x
  2. Step 2: Convert to fraction form
    128,908.78/177,926.81 = 88,089.42/x
  3. Step 3: Cross multiply
    128,908.78x = 177,926.81 × 88,089.42
  4. Step 4: Simplify right side
    128,908.78x = 15,673,469,722.13
  5. Step 5: Solve for x
    x = 15,673,469,722.13/128,908.78
  6. Step 6: Final answer
    x = 121,585.74

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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.