Home / 81,379.90-121,880.31-79,137.69

Finding the Fourth Proportional to 81,379.90, 121,880.31 and 79,137.69

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Solution

The fourth proportional to 81,379.90, 121,880.31 and 79,137.69 is: 118,522.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,379.90 : 121,880.31 = 79,137.69 : x
  2. Step 2: Convert to fraction form
    81,379.90/121,880.31 = 79,137.69/x
  3. Step 3: Cross multiply
    81,379.90x = 121,880.31 × 79,137.69
  4. Step 4: Simplify right side
    81,379.90x = 9,645,326,189.88
  5. Step 5: Solve for x
    x = 9,645,326,189.88/81,379.90
  6. Step 6: Final answer
    x = 118,522.22

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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.