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Finding the Fourth Proportional to 2,630.70, 3,945.44 and 781.37

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Solution

The fourth proportional to 2,630.70, 3,945.44 and 781.37 is: 1,171.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.70 : 3,945.44 = 781.37 : x
  2. Step 2: Convert to fraction form
    2,630.70/3,945.44 = 781.37/x
  3. Step 3: Cross multiply
    2,630.70x = 3,945.44 × 781.37
  4. Step 4: Simplify right side
    2,630.70x = 3,082,845.47
  5. Step 5: Solve for x
    x = 3,082,845.47/2,630.70
  6. Step 6: Final answer
    x = 1,171.87

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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.