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Finding the Fourth Proportional to 79,940.78, 119,911.53 and 20,772.26

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Solution

The fourth proportional to 79,940.78, 119,911.53 and 20,772.26 is: 31,158.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,940.78 : 119,911.53 = 20,772.26 : x
  2. Step 2: Convert to fraction form
    79,940.78/119,911.53 = 20,772.26/x
  3. Step 3: Cross multiply
    79,940.78x = 119,911.53 × 20,772.26
  4. Step 4: Simplify right side
    79,940.78x = 2,490,833,478.16
  5. Step 5: Solve for x
    x = 2,490,833,478.16/79,940.78
  6. Step 6: Final answer
    x = 31,158.48

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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.