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Finding the Fourth Proportional to 1,012.54, 1,396.02 and 680.44

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Solution

The fourth proportional to 1,012.54, 1,396.02 and 680.44 is: 938.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.54 : 1,396.02 = 680.44 : x
  2. Step 2: Convert to fraction form
    1,012.54/1,396.02 = 680.44/x
  3. Step 3: Cross multiply
    1,012.54x = 1,396.02 × 680.44
  4. Step 4: Simplify right side
    1,012.54x = 949,907.85
  5. Step 5: Solve for x
    x = 949,907.85/1,012.54
  6. Step 6: Final answer
    x = 938.14

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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.