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Finding the Fourth Proportional to 1,122.64, 1,549 and 680.56

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Solution

The fourth proportional to 1,122.64, 1,549 and 680.56 is: 939.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.64 : 1,549 = 680.56 : x
  2. Step 2: Convert to fraction form
    1,122.64/1,549 = 680.56/x
  3. Step 3: Cross multiply
    1,122.64x = 1,549 × 680.56
  4. Step 4: Simplify right side
    1,122.64x = 1,054,187.44
  5. Step 5: Solve for x
    x = 1,054,187.44/1,122.64
  6. Step 6: Final answer
    x = 939.03

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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.