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Finding the Fourth Proportional to 1,378.26, 2,068.41 and 762.49

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Solution

The fourth proportional to 1,378.26, 2,068.41 and 762.49 is: 1,144.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.26 : 2,068.41 = 762.49 : x
  2. Step 2: Convert to fraction form
    1,378.26/2,068.41 = 762.49/x
  3. Step 3: Cross multiply
    1,378.26x = 2,068.41 × 762.49
  4. Step 4: Simplify right side
    1,378.26x = 1,577,141.94
  5. Step 5: Solve for x
    x = 1,577,141.94/1,378.26
  6. Step 6: Final answer
    x = 1,144.30

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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.