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Finding the Fourth Proportional to 121,751.87, 182,668.82 and 76,720.94

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Solution

The fourth proportional to 121,751.87, 182,668.82 and 76,720.94 is: 115,107.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,751.87 : 182,668.82 = 76,720.94 : x
  2. Step 2: Convert to fraction form
    121,751.87/182,668.82 = 76,720.94/x
  3. Step 3: Cross multiply
    121,751.87x = 182,668.82 × 76,720.94
  4. Step 4: Simplify right side
    121,751.87x = 14,014,523,579.09
  5. Step 5: Solve for x
    x = 14,014,523,579.09/121,751.87
  6. Step 6: Final answer
    x = 115,107.26

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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.