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Finding the Fourth Proportional to 221,013.20, 331,129.40 and 213,704.40

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Solution

The fourth proportional to 221,013.20, 331,129.40 and 213,704.40 is: 320,179.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,013.20 : 331,129.40 = 213,704.40 : x
  2. Step 2: Convert to fraction form
    221,013.20/331,129.40 = 213,704.40/x
  3. Step 3: Cross multiply
    221,013.20x = 331,129.40 × 213,704.40
  4. Step 4: Simplify right side
    221,013.20x = 70,763,809,749.36
  5. Step 5: Solve for x
    x = 70,763,809,749.36/221,013.20
  6. Step 6: Final answer
    x = 320,179.11

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1.5x scale

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.