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Finding the Fourth Proportional to 207,879.40, 311,964.90 and 133,181.20

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Solution

The fourth proportional to 207,879.40, 311,964.90 and 133,181.20 is: 199,865.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,879.40 : 311,964.90 = 133,181.20 : x
  2. Step 2: Convert to fraction form
    207,879.40/311,964.90 = 133,181.20/x
  3. Step 3: Cross multiply
    207,879.40x = 311,964.90 × 133,181.20
  4. Step 4: Simplify right side
    207,879.40x = 41,547,859,739.88
  5. Step 5: Solve for x
    x = 41,547,859,739.88/207,879.40
  6. Step 6: Final answer
    x = 199,865.21

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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.