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Finding the Fourth Proportional to 128,306.80, 177,057.81 and 70,162.48

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Solution

The fourth proportional to 128,306.80, 177,057.81 and 70,162.48 is: 96,821.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,306.80 : 177,057.81 = 70,162.48 : x
  2. Step 2: Convert to fraction form
    128,306.80/177,057.81 = 70,162.48/x
  3. Step 3: Cross multiply
    128,306.80x = 177,057.81 × 70,162.48
  4. Step 4: Simplify right side
    128,306.80x = 12,422,815,052.97
  5. Step 5: Solve for x
    x = 12,422,815,052.97/128,306.80
  6. Step 6: Final answer
    x = 96,821.17

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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.