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Finding the Fourth Proportional to 262.10, 393.70 and 221.60

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Solution

The fourth proportional to 262.10, 393.70 and 221.60 is: 332.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.10 : 393.70 = 221.60 : x
  2. Step 2: Convert to fraction form
    262.10/393.70 = 221.60/x
  3. Step 3: Cross multiply
    262.10x = 393.70 × 221.60
  4. Step 4: Simplify right side
    262.10x = 87,243.92
  5. Step 5: Solve for x
    x = 87,243.92/262.10
  6. Step 6: Final answer
    x = 332.87

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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.