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Finding the Fourth Proportional to 419,947.20, 629,920.80 and 209,995.20

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Solution

The fourth proportional to 419,947.20, 629,920.80 and 209,995.20 is: 314,992.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,947.20 : 629,920.80 = 209,995.20 : x
  2. Step 2: Convert to fraction form
    419,947.20/629,920.80 = 209,995.20/x
  3. Step 3: Cross multiply
    419,947.20x = 629,920.80 × 209,995.20
  4. Step 4: Simplify right side
    419,947.20x = 132,280,344,380.16
  5. Step 5: Solve for x
    x = 132,280,344,380.16/419,947.20
  6. Step 6: Final answer
    x = 314,992.80

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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.