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Finding the Fourth Proportional to 128,379.80, 177,164.46 and 71,791.17

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Solution

The fourth proportional to 128,379.80, 177,164.46 and 71,791.17 is: 99,072.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,379.80 : 177,164.46 = 71,791.17 : x
  2. Step 2: Convert to fraction form
    128,379.80/177,164.46 = 71,791.17/x
  3. Step 3: Cross multiply
    128,379.80x = 177,164.46 × 71,791.17
  4. Step 4: Simplify right side
    128,379.80x = 12,718,843,865.82
  5. Step 5: Solve for x
    x = 12,718,843,865.82/128,379.80
  6. Step 6: Final answer
    x = 99,072.01

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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.