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Finding the Fourth Proportional to 100,990.75, 139,366.48 and 55,668.78

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Solution

The fourth proportional to 100,990.75, 139,366.48 and 55,668.78 is: 76,822.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.75 : 139,366.48 = 55,668.78 : x
  2. Step 2: Convert to fraction form
    100,990.75/139,366.48 = 55,668.78/x
  3. Step 3: Cross multiply
    100,990.75x = 139,366.48 × 55,668.78
  4. Step 4: Simplify right side
    100,990.75x = 7,758,361,914.49
  5. Step 5: Solve for x
    x = 7,758,361,914.49/100,990.75
  6. Step 6: Final answer
    x = 76,822.50

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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.