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Finding the Fourth Proportional to 431,440.80, 647,161.20 and 263,479.20

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Solution

The fourth proportional to 431,440.80, 647,161.20 and 263,479.20 is: 395,218.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,440.80 : 647,161.20 = 263,479.20 : x
  2. Step 2: Convert to fraction form
    431,440.80/647,161.20 = 263,479.20/x
  3. Step 3: Cross multiply
    431,440.80x = 647,161.20 × 263,479.20
  4. Step 4: Simplify right side
    431,440.80x = 170,513,515,247.04
  5. Step 5: Solve for x
    x = 170,513,515,247.04/431,440.80
  6. Step 6: Final answer
    x = 395,218.80

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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.