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Finding the Fourth Proportional to 128,517.72, 177,352.62 and 71,151.54

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Solution

The fourth proportional to 128,517.72, 177,352.62 and 71,151.54 is: 98,188.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,517.72 : 177,352.62 = 71,151.54 : x
  2. Step 2: Convert to fraction form
    128,517.72/177,352.62 = 71,151.54/x
  3. Step 3: Cross multiply
    128,517.72x = 177,352.62 × 71,151.54
  4. Step 4: Simplify right side
    128,517.72x = 12,618,912,036.03
  5. Step 5: Solve for x
    x = 12,618,912,036.03/128,517.72
  6. Step 6: Final answer
    x = 98,188.11

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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.