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Finding the Fourth Proportional to 76,991.58, 115,495.29 and 20,831.94

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Solution

The fourth proportional to 76,991.58, 115,495.29 and 20,831.94 is: 31,250.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,991.58 : 115,495.29 = 20,831.94 : x
  2. Step 2: Convert to fraction form
    76,991.58/115,495.29 = 20,831.94/x
  3. Step 3: Cross multiply
    76,991.58x = 115,495.29 × 20,831.94
  4. Step 4: Simplify right side
    76,991.58x = 2,405,990,951.56
  5. Step 5: Solve for x
    x = 2,405,990,951.56/76,991.58
  6. Step 6: Final answer
    x = 31,250.05

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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.