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Finding the Fourth Proportional to 1,257.82, 1,889.81 and 1,187.88

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Solution

The fourth proportional to 1,257.82, 1,889.81 and 1,187.88 is: 1,784.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.82 : 1,889.81 = 1,187.88 : x
  2. Step 2: Convert to fraction form
    1,257.82/1,889.81 = 1,187.88/x
  3. Step 3: Cross multiply
    1,257.82x = 1,889.81 × 1,187.88
  4. Step 4: Simplify right side
    1,257.82x = 2,244,861.56
  5. Step 5: Solve for x
    x = 2,244,861.56/1,257.82
  6. Step 6: Final answer
    x = 1,784.72

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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.