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Finding the Fourth Proportional to 79,939.20, 119,937.60 and 77,059.20

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Solution

The fourth proportional to 79,939.20, 119,937.60 and 77,059.20 is: 115,616.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,939.20 : 119,937.60 = 77,059.20 : x
  2. Step 2: Convert to fraction form
    79,939.20/119,937.60 = 77,059.20/x
  3. Step 3: Cross multiply
    79,939.20x = 119,937.60 × 77,059.20
  4. Step 4: Simplify right side
    79,939.20x = 9,242,295,505.92
  5. Step 5: Solve for x
    x = 9,242,295,505.92/79,939.20
  6. Step 6: Final answer
    x = 115,616.56

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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.