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Finding the Fourth Proportional to 331,021.76, 495,881.32 and 218,357.78

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Solution

The fourth proportional to 331,021.76, 495,881.32 and 218,357.78 is: 327,107.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,021.76 : 495,881.32 = 218,357.78 : x
  2. Step 2: Convert to fraction form
    331,021.76/495,881.32 = 218,357.78/x
  3. Step 3: Cross multiply
    331,021.76x = 495,881.32 × 218,357.78
  4. Step 4: Simplify right side
    331,021.76x = 108,279,544,178.67
  5. Step 5: Solve for x
    x = 108,279,544,178.67/331,021.76
  6. Step 6: Final answer
    x = 327,107.03

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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.