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Finding the Fourth Proportional to 1,213.74, 1,817.78 and 1,115.73

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Solution

The fourth proportional to 1,213.74, 1,817.78 and 1,115.73 is: 1,670.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.74 : 1,817.78 = 1,115.73 : x
  2. Step 2: Convert to fraction form
    1,213.74/1,817.78 = 1,115.73/x
  3. Step 3: Cross multiply
    1,213.74x = 1,817.78 × 1,115.73
  4. Step 4: Simplify right side
    1,213.74x = 2,028,146.10
  5. Step 5: Solve for x
    x = 2,028,146.10/1,213.74
  6. Step 6: Final answer
    x = 1,670.99

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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.