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Finding the Fourth Proportional to 1,361.28, 2,042.07 and 620.76

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Solution

The fourth proportional to 1,361.28, 2,042.07 and 620.76 is: 931.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.28 : 2,042.07 = 620.76 : x
  2. Step 2: Convert to fraction form
    1,361.28/2,042.07 = 620.76/x
  3. Step 3: Cross multiply
    1,361.28x = 2,042.07 × 620.76
  4. Step 4: Simplify right side
    1,361.28x = 1,267,635.37
  5. Step 5: Solve for x
    x = 1,267,635.37/1,361.28
  6. Step 6: Final answer
    x = 931.21

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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.