Home / 81,217.44-121,636.92-78,975.36

Finding the Fourth Proportional to 81,217.44, 121,636.92 and 78,975.36

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Solution

The fourth proportional to 81,217.44, 121,636.92 and 78,975.36 is: 118,279.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,217.44 : 121,636.92 = 78,975.36 : x
  2. Step 2: Convert to fraction form
    81,217.44/121,636.92 = 78,975.36/x
  3. Step 3: Cross multiply
    81,217.44x = 121,636.92 × 78,975.36
  4. Step 4: Simplify right side
    81,217.44x = 9,606,319,546.29
  5. Step 5: Solve for x
    x = 9,606,319,546.29/81,217.44
  6. Step 6: Final answer
    x = 118,279.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.