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Finding the Fourth Proportional to 76,986.80, 115,495.80 and 43,722.80

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Solution

The fourth proportional to 76,986.80, 115,495.80 and 43,722.80 is: 65,593.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,986.80 : 115,495.80 = 43,722.80 : x
  2. Step 2: Convert to fraction form
    76,986.80/115,495.80 = 43,722.80/x
  3. Step 3: Cross multiply
    76,986.80x = 115,495.80 × 43,722.80
  4. Step 4: Simplify right side
    76,986.80x = 5,049,799,764.24
  5. Step 5: Solve for x
    x = 5,049,799,764.24/76,986.80
  6. Step 6: Final answer
    x = 65,593.06

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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.