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Finding the Fourth Proportional to 81,709.56, 112,759.56 and 45,911.88

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Solution

The fourth proportional to 81,709.56, 112,759.56 and 45,911.88 is: 63,358.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,709.56 : 112,759.56 = 45,911.88 : x
  2. Step 2: Convert to fraction form
    81,709.56/112,759.56 = 45,911.88/x
  3. Step 3: Cross multiply
    81,709.56x = 112,759.56 × 45,911.88
  4. Step 4: Simplify right side
    81,709.56x = 5,177,003,387.57
  5. Step 5: Solve for x
    x = 5,177,003,387.57/81,709.56
  6. Step 6: Final answer
    x = 63,358.60

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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.