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Finding the Fourth Proportional to 79,940.40, 109,516.68 and 76,949.04

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Solution

The fourth proportional to 79,940.40, 109,516.68 and 76,949.04 is: 105,418.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,940.40 : 109,516.68 = 76,949.04 : x
  2. Step 2: Convert to fraction form
    79,940.40/109,516.68 = 76,949.04/x
  3. Step 3: Cross multiply
    79,940.40x = 109,516.68 × 76,949.04
  4. Step 4: Simplify right side
    79,940.40x = 8,427,203,389.99
  5. Step 5: Solve for x
    x = 8,427,203,389.99/79,940.40
  6. Step 6: Final answer
    x = 105,418.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.