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Finding the Fourth Proportional to 415.21, 622.77 and 299.86

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Solution

The fourth proportional to 415.21, 622.77 and 299.86 is: 449.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.21 : 622.77 = 299.86 : x
  2. Step 2: Convert to fraction form
    415.21/622.77 = 299.86/x
  3. Step 3: Cross multiply
    415.21x = 622.77 × 299.86
  4. Step 4: Simplify right side
    415.21x = 186,740.70
  5. Step 5: Solve for x
    x = 186,740.70/415.21
  6. Step 6: Final answer
    x = 449.76

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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.