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Finding the Fourth Proportional to 221,353.20, 331,986.60 and 71,557.20

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Solution

The fourth proportional to 221,353.20, 331,986.60 and 71,557.20 is: 107,321.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,353.20 : 331,986.60 = 71,557.20 : x
  2. Step 2: Convert to fraction form
    221,353.20/331,986.60 = 71,557.20/x
  3. Step 3: Cross multiply
    221,353.20x = 331,986.60 × 71,557.20
  4. Step 4: Simplify right side
    221,353.20x = 23,756,031,533.52
  5. Step 5: Solve for x
    x = 23,756,031,533.52/221,353.20
  6. Step 6: Final answer
    x = 107,321.83

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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.