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Finding the Fourth Proportional to 639,659.37, 959,168.17 and 213,045.21

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Solution

The fourth proportional to 639,659.37, 959,168.17 and 213,045.21 is: 319,460.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,659.37 : 959,168.17 = 213,045.21 : x
  2. Step 2: Convert to fraction form
    639,659.37/959,168.17 = 213,045.21/x
  3. Step 3: Cross multiply
    639,659.37x = 959,168.17 × 213,045.21
  4. Step 4: Simplify right side
    639,659.37x = 204,346,184,202.97
  5. Step 5: Solve for x
    x = 204,346,184,202.97/639,659.37
  6. Step 6: Final answer
    x = 319,460.94

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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.