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Finding the Fourth Proportional to 314.31, 433.62 and 221.19

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Solution

The fourth proportional to 314.31, 433.62 and 221.19 is: 305.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.31 : 433.62 = 221.19 : x
  2. Step 2: Convert to fraction form
    314.31/433.62 = 221.19/x
  3. Step 3: Cross multiply
    314.31x = 433.62 × 221.19
  4. Step 4: Simplify right side
    314.31x = 95,912.41
  5. Step 5: Solve for x
    x = 95,912.41/314.31
  6. Step 6: Final answer
    x = 305.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.