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Finding the Fourth Proportional to 1,327.87, 1,989.06 and 838.54

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Solution

The fourth proportional to 1,327.87, 1,989.06 and 838.54 is: 1,256.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.87 : 1,989.06 = 838.54 : x
  2. Step 2: Convert to fraction form
    1,327.87/1,989.06 = 838.54/x
  3. Step 3: Cross multiply
    1,327.87x = 1,989.06 × 838.54
  4. Step 4: Simplify right side
    1,327.87x = 1,667,896.43
  5. Step 5: Solve for x
    x = 1,667,896.43/1,327.87
  6. Step 6: Final answer
    x = 1,256.07

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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.