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Finding the Fourth Proportional to 431,582.20, 647,567.70 and 206,855.80

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Solution

The fourth proportional to 431,582.20, 647,567.70 and 206,855.80 is: 310,376.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,582.20 : 647,567.70 = 206,855.80 : x
  2. Step 2: Convert to fraction form
    431,582.20/647,567.70 = 206,855.80/x
  3. Step 3: Cross multiply
    431,582.20x = 647,567.70 × 206,855.80
  4. Step 4: Simplify right side
    431,582.20x = 133,953,134,637.66
  5. Step 5: Solve for x
    x = 133,953,134,637.66/431,582.20
  6. Step 6: Final answer
    x = 310,376.88

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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.