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Finding the Fourth Proportional to 391,015, 539,600.70 and 212,167

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Solution

The fourth proportional to 391,015, 539,600.70 and 212,167 is: 292,790.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,015 : 539,600.70 = 212,167 : x
  2. Step 2: Convert to fraction form
    391,015/539,600.70 = 212,167/x
  3. Step 3: Cross multiply
    391,015x = 539,600.70 × 212,167
  4. Step 4: Simplify right side
    391,015x = 114,485,461,716.90
  5. Step 5: Solve for x
    x = 114,485,461,716.90/391,015
  6. Step 6: Final answer
    x = 292,790.46

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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.