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Finding the Fourth Proportional to 100,990.75, 139,367.20 and 55,669.49

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Solution

The fourth proportional to 100,990.75, 139,367.20 and 55,669.49 is: 76,823.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.75 : 139,367.20 = 55,669.49 : x
  2. Step 2: Convert to fraction form
    100,990.75/139,367.20 = 55,669.49/x
  3. Step 3: Cross multiply
    100,990.75x = 139,367.20 × 55,669.49
  4. Step 4: Simplify right side
    100,990.75x = 7,758,500,698.86
  5. Step 5: Solve for x
    x = 7,758,500,698.86/100,990.75
  6. Step 6: Final answer
    x = 76,823.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.