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Finding the Fourth Proportional to 639,805.23, 959,609.43 and 213,348.47

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Solution

The fourth proportional to 639,805.23, 959,609.43 and 213,348.47 is: 319,989.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,805.23 : 959,609.43 = 213,348.47 : x
  2. Step 2: Convert to fraction form
    639,805.23/959,609.43 = 213,348.47/x
  3. Step 3: Cross multiply
    639,805.23x = 959,609.43 × 213,348.47
  4. Step 4: Simplify right side
    639,805.23x = 204,731,198,890.03
  5. Step 5: Solve for x
    x = 204,731,198,890.03/639,805.23
  6. Step 6: Final answer
    x = 319,989.88

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1.5x scale

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.