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Finding the Fourth Proportional to 431,631.80, 647,447.70 and 405,366.20

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Solution

The fourth proportional to 431,631.80, 647,447.70 and 405,366.20 is: 608,049.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,631.80 : 647,447.70 = 405,366.20 : x
  2. Step 2: Convert to fraction form
    431,631.80/647,447.70 = 405,366.20/x
  3. Step 3: Cross multiply
    431,631.80x = 647,447.70 × 405,366.20
  4. Step 4: Simplify right side
    431,631.80x = 262,453,413,847.74
  5. Step 5: Solve for x
    x = 262,453,413,847.74/431,631.80
  6. Step 6: Final answer
    x = 608,049.30

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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.