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Finding the Fourth Proportional to 415.21, 622.91 and 126.67

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Solution

The fourth proportional to 415.21, 622.91 and 126.67 is: 190.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.21 : 622.91 = 126.67 : x
  2. Step 2: Convert to fraction form
    415.21/622.91 = 126.67/x
  3. Step 3: Cross multiply
    415.21x = 622.91 × 126.67
  4. Step 4: Simplify right side
    415.21x = 78,904.01
  5. Step 5: Solve for x
    x = 78,904.01/415.21
  6. Step 6: Final answer
    x = 190.03

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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.