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Finding the Fourth Proportional to 300.21, 449.53 and 257.15

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Solution

The fourth proportional to 300.21, 449.53 and 257.15 is: 385.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.21 : 449.53 = 257.15 : x
  2. Step 2: Convert to fraction form
    300.21/449.53 = 257.15/x
  3. Step 3: Cross multiply
    300.21x = 449.53 × 257.15
  4. Step 4: Simplify right side
    300.21x = 115,597.28
  5. Step 5: Solve for x
    x = 115,597.28/300.21
  6. Step 6: Final answer
    x = 385.06

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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.