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Finding the Fourth Proportional to 1,376.28, 2,063.07 and 644.94

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Solution

The fourth proportional to 1,376.28, 2,063.07 and 644.94 is: 966.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.28 : 2,063.07 = 644.94 : x
  2. Step 2: Convert to fraction form
    1,376.28/2,063.07 = 644.94/x
  3. Step 3: Cross multiply
    1,376.28x = 2,063.07 × 644.94
  4. Step 4: Simplify right side
    1,376.28x = 1,330,556.37
  5. Step 5: Solve for x
    x = 1,330,556.37/1,376.28
  6. Step 6: Final answer
    x = 966.78

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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.