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Finding the Fourth Proportional to 81,713.75, 112,778.36 and 68,080.18

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Solution

The fourth proportional to 81,713.75, 112,778.36 and 68,080.18 is: 93,961.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,713.75 : 112,778.36 = 68,080.18 : x
  2. Step 2: Convert to fraction form
    81,713.75/112,778.36 = 68,080.18/x
  3. Step 3: Cross multiply
    81,713.75x = 112,778.36 × 68,080.18
  4. Step 4: Simplify right side
    81,713.75x = 7,677,971,048.90
  5. Step 5: Solve for x
    x = 7,677,971,048.90/81,713.75
  6. Step 6: Final answer
    x = 93,961.80

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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.