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Finding the Fourth Proportional to 207,939.20, 311,908.80 and 113,460.80

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Solution

The fourth proportional to 207,939.20, 311,908.80 and 113,460.80 is: 170,191.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,939.20 : 311,908.80 = 113,460.80 : x
  2. Step 2: Convert to fraction form
    207,939.20/311,908.80 = 113,460.80/x
  3. Step 3: Cross multiply
    207,939.20x = 311,908.80 × 113,460.80
  4. Step 4: Simplify right side
    207,939.20x = 35,389,421,975.04
  5. Step 5: Solve for x
    x = 35,389,421,975.04/207,939.20
  6. Step 6: Final answer
    x = 170,191.20

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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.