Home / 431,705.20-647,557.80-386,604.40

Finding the Fourth Proportional to 431,705.20, 647,557.80 and 386,604.40

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Solution

The fourth proportional to 431,705.20, 647,557.80 and 386,604.40 is: 579,906.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,705.20 : 647,557.80 = 386,604.40 : x
  2. Step 2: Convert to fraction form
    431,705.20/647,557.80 = 386,604.40/x
  3. Step 3: Cross multiply
    431,705.20x = 647,557.80 × 386,604.40
  4. Step 4: Simplify right side
    431,705.20x = 250,348,694,734.32
  5. Step 5: Solve for x
    x = 250,348,694,734.32/431,705.20
  6. Step 6: Final answer
    x = 579,906.60

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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.