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Finding the Fourth Proportional to 128,876.79, 177,845.33 and 71,518.62

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Solution

The fourth proportional to 128,876.79, 177,845.33 and 71,518.62 is: 98,693.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,876.79 : 177,845.33 = 71,518.62 : x
  2. Step 2: Convert to fraction form
    128,876.79/177,845.33 = 71,518.62/x
  3. Step 3: Cross multiply
    128,876.79x = 177,845.33 × 71,518.62
  4. Step 4: Simplify right side
    128,876.79x = 12,719,252,217.45
  5. Step 5: Solve for x
    x = 12,719,252,217.45/128,876.79
  6. Step 6: Final answer
    x = 98,693.12

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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.