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Finding the Fourth Proportional to 218,933.40, 327,708.90 and 212,021.40

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Solution

The fourth proportional to 218,933.40, 327,708.90 and 212,021.40 is: 317,362.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,933.40 : 327,708.90 = 212,021.40 : x
  2. Step 2: Convert to fraction form
    218,933.40/327,708.90 = 212,021.40/x
  3. Step 3: Cross multiply
    218,933.40x = 327,708.90 × 212,021.40
  4. Step 4: Simplify right side
    218,933.40x = 69,481,299,770.46
  5. Step 5: Solve for x
    x = 69,481,299,770.46/218,933.40
  6. Step 6: Final answer
    x = 317,362.72

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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.