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Finding the Fourth Proportional to 391,001, 539,584.26 and 212,153

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Solution

The fourth proportional to 391,001, 539,584.26 and 212,153 is: 292,772.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,001 : 539,584.26 = 212,153 : x
  2. Step 2: Convert to fraction form
    391,001/539,584.26 = 212,153/x
  3. Step 3: Cross multiply
    391,001x = 539,584.26 × 212,153
  4. Step 4: Simplify right side
    391,001x = 114,474,419,511.78
  5. Step 5: Solve for x
    x = 114,474,419,511.78/391,001
  6. Step 6: Final answer
    x = 292,772.70

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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.