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Finding the Fourth Proportional to 1,236.79, 1,855.28 and 415.09

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Solution

The fourth proportional to 1,236.79, 1,855.28 and 415.09 is: 622.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.79 : 1,855.28 = 415.09 : x
  2. Step 2: Convert to fraction form
    1,236.79/1,855.28 = 415.09/x
  3. Step 3: Cross multiply
    1,236.79x = 1,855.28 × 415.09
  4. Step 4: Simplify right side
    1,236.79x = 770,108.18
  5. Step 5: Solve for x
    x = 770,108.18/1,236.79
  6. Step 6: Final answer
    x = 622.67

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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.