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Finding the Fourth Proportional to 1,378.78, 1,902.66 and 757.78

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Solution

The fourth proportional to 1,378.78, 1,902.66 and 757.78 is: 1,045.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.78 : 1,902.66 = 757.78 : x
  2. Step 2: Convert to fraction form
    1,378.78/1,902.66 = 757.78/x
  3. Step 3: Cross multiply
    1,378.78x = 1,902.66 × 757.78
  4. Step 4: Simplify right side
    1,378.78x = 1,441,797.69
  5. Step 5: Solve for x
    x = 1,441,797.69/1,378.78
  6. Step 6: Final answer
    x = 1,045.71

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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.