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Finding the Fourth Proportional to 431,296.70, 647,139.45 and 206,570.30

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Solution

The fourth proportional to 431,296.70, 647,139.45 and 206,570.30 is: 309,948.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,296.70 : 647,139.45 = 206,570.30 : x
  2. Step 2: Convert to fraction form
    431,296.70/647,139.45 = 206,570.30/x
  3. Step 3: Cross multiply
    431,296.70x = 647,139.45 × 206,570.30
  4. Step 4: Simplify right side
    431,296.70x = 133,679,790,328.34
  5. Step 5: Solve for x
    x = 133,679,790,328.34/431,296.70
  6. Step 6: Final answer
    x = 309,948.56

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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.