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Finding the Fourth Proportional to 336.87, 505.35 and 221.31

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Solution

The fourth proportional to 336.87, 505.35 and 221.31 is: 331.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.87 : 505.35 = 221.31 : x
  2. Step 2: Convert to fraction form
    336.87/505.35 = 221.31/x
  3. Step 3: Cross multiply
    336.87x = 505.35 × 221.31
  4. Step 4: Simplify right side
    336.87x = 111,839.01
  5. Step 5: Solve for x
    x = 111,839.01/336.87
  6. Step 6: Final answer
    x = 331.99

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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.