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Finding the Fourth Proportional to 1,236.72, 1,855.09 and 415.00

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Solution

The fourth proportional to 1,236.72, 1,855.09 and 415.00 is: 622.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.72 : 1,855.09 = 415.00 : x
  2. Step 2: Convert to fraction form
    1,236.72/1,855.09 = 415.00/x
  3. Step 3: Cross multiply
    1,236.72x = 1,855.09 × 415.00
  4. Step 4: Simplify right side
    1,236.72x = 769,859.39
  5. Step 5: Solve for x
    x = 769,859.39/1,236.72
  6. Step 6: Final answer
    x = 622.50

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Double scale
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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.