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Finding the Fourth Proportional to 639,513.63, 959,365.22 and 212,910.12

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Solution

The fourth proportional to 639,513.63, 959,365.22 and 212,910.12 is: 319,396.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,513.63 : 959,365.22 = 212,910.12 : x
  2. Step 2: Convert to fraction form
    639,513.63/959,365.22 = 212,910.12/x
  3. Step 3: Cross multiply
    639,513.63x = 959,365.22 × 212,910.12
  4. Step 4: Simplify right side
    639,513.63x = 204,258,563,049.48
  5. Step 5: Solve for x
    x = 204,258,563,049.48/639,513.63
  6. Step 6: Final answer
    x = 319,396.73

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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.