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Finding the Fourth Proportional to 431,447.80, 647,171.70 and 263,486.20

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Solution

The fourth proportional to 431,447.80, 647,171.70 and 263,486.20 is: 395,229.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,447.80 : 647,171.70 = 263,486.20 : x
  2. Step 2: Convert to fraction form
    431,447.80/647,171.70 = 263,486.20/x
  3. Step 3: Cross multiply
    431,447.80x = 647,171.70 × 263,486.20
  4. Step 4: Simplify right side
    431,447.80x = 170,520,811,980.54
  5. Step 5: Solve for x
    x = 170,520,811,980.54/431,447.80
  6. Step 6: Final answer
    x = 395,229.30

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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.