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Finding the Fourth Proportional to 128,940.80, 177,935.40 and 71,576.73

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Solution

The fourth proportional to 128,940.80, 177,935.40 and 71,576.73 is: 98,774.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.80 : 177,935.40 = 71,576.73 : x
  2. Step 2: Convert to fraction form
    128,940.80/177,935.40 = 71,576.73/x
  3. Step 3: Cross multiply
    128,940.80x = 177,935.40 × 71,576.73
  4. Step 4: Simplify right side
    128,940.80x = 12,736,034,083.24
  5. Step 5: Solve for x
    x = 12,736,034,083.24/128,940.80
  6. Step 6: Final answer
    x = 98,774.28

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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.