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Finding the Fourth Proportional to 207,920.20, 311,880.30 and 123,720.70

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Solution

The fourth proportional to 207,920.20, 311,880.30 and 123,720.70 is: 185,581.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,920.20 : 311,880.30 = 123,720.70 : x
  2. Step 2: Convert to fraction form
    207,920.20/311,880.30 = 123,720.70/x
  3. Step 3: Cross multiply
    207,920.20x = 311,880.30 × 123,720.70
  4. Step 4: Simplify right side
    207,920.20x = 38,586,049,032.21
  5. Step 5: Solve for x
    x = 38,586,049,032.21/207,920.20
  6. Step 6: Final answer
    x = 185,581.05

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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.