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Finding the Fourth Proportional to 100,880.39, 139,231.58 and 76,961.90

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Solution

The fourth proportional to 100,880.39, 139,231.58 and 76,961.90 is: 106,220.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,880.39 : 139,231.58 = 76,961.90 : x
  2. Step 2: Convert to fraction form
    100,880.39/139,231.58 = 76,961.90/x
  3. Step 3: Cross multiply
    100,880.39x = 139,231.58 × 76,961.90
  4. Step 4: Simplify right side
    100,880.39x = 10,715,525,855.83
  5. Step 5: Solve for x
    x = 10,715,525,855.83/100,880.39
  6. Step 6: Final answer
    x = 106,220.11

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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.