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Finding the Fourth Proportional to 431,570.20, 647,355.30 and 389,579.80

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Solution

The fourth proportional to 431,570.20, 647,355.30 and 389,579.80 is: 584,369.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,570.20 : 647,355.30 = 389,579.80 : x
  2. Step 2: Convert to fraction form
    431,570.20/647,355.30 = 389,579.80/x
  3. Step 3: Cross multiply
    431,570.20x = 647,355.30 × 389,579.80
  4. Step 4: Simplify right side
    431,570.20x = 252,196,548,302.94
  5. Step 5: Solve for x
    x = 252,196,548,302.94/431,570.20
  6. Step 6: Final answer
    x = 584,369.70

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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.