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Finding the Fourth Proportional to 71,105.75, 98,135.40 and 68,769.15

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Solution

The fourth proportional to 71,105.75, 98,135.40 and 68,769.15 is: 94,910.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,105.75 : 98,135.40 = 68,769.15 : x
  2. Step 2: Convert to fraction form
    71,105.75/98,135.40 = 68,769.15/x
  3. Step 3: Cross multiply
    71,105.75x = 98,135.40 × 68,769.15
  4. Step 4: Simplify right side
    71,105.75x = 6,748,688,097.97
  5. Step 5: Solve for x
    x = 6,748,688,097.97/71,105.75
  6. Step 6: Final answer
    x = 94,910.58

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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.