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Finding the Fourth Proportional to 639,242.31, 959,019.53 and 212,777.31

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Solution

The fourth proportional to 639,242.31, 959,019.53 and 212,777.31 is: 319,217.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,242.31 : 959,019.53 = 212,777.31 : x
  2. Step 2: Convert to fraction form
    639,242.31/959,019.53 = 212,777.31/x
  3. Step 3: Cross multiply
    639,242.31x = 959,019.53 × 212,777.31
  4. Step 4: Simplify right side
    639,242.31x = 204,057,595,830.86
  5. Step 5: Solve for x
    x = 204,057,595,830.86/639,242.31
  6. Step 6: Final answer
    x = 319,217.91

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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.