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Finding the Fourth Proportional to 207,919.70, 311,879.55 and 123,720.20

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Solution

The fourth proportional to 207,919.70, 311,879.55 and 123,720.20 is: 185,580.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,919.70 : 311,879.55 = 123,720.20 : x
  2. Step 2: Convert to fraction form
    207,919.70/311,879.55 = 123,720.20/x
  3. Step 3: Cross multiply
    207,919.70x = 311,879.55 × 123,720.20
  4. Step 4: Simplify right side
    207,919.70x = 38,585,800,301.91
  5. Step 5: Solve for x
    x = 38,585,800,301.91/207,919.70
  6. Step 6: Final answer
    x = 185,580.30

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1.5x scale

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.