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Finding the Fourth Proportional to 1,380.38, 1,904.92 and 759.38

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Solution

The fourth proportional to 1,380.38, 1,904.92 and 759.38 is: 1,047.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.38 : 1,904.92 = 759.38 : x
  2. Step 2: Convert to fraction form
    1,380.38/1,904.92 = 759.38/x
  3. Step 3: Cross multiply
    1,380.38x = 1,904.92 × 759.38
  4. Step 4: Simplify right side
    1,380.38x = 1,446,546.73
  5. Step 5: Solve for x
    x = 1,446,546.73/1,380.38
  6. Step 6: Final answer
    x = 1,047.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.