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Finding the Fourth Proportional to 391,231.44, 539,906.20 and 219,147.88

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Solution

The fourth proportional to 391,231.44, 539,906.20 and 219,147.88 is: 302,427.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,231.44 : 539,906.20 = 219,147.88 : x
  2. Step 2: Convert to fraction form
    391,231.44/539,906.20 = 219,147.88/x
  3. Step 3: Cross multiply
    391,231.44x = 539,906.20 × 219,147.88
  4. Step 4: Simplify right side
    391,231.44x = 118,319,299,128.86
  5. Step 5: Solve for x
    x = 118,319,299,128.86/391,231.44
  6. Step 6: Final answer
    x = 302,427.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.