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Finding the Fourth Proportional to 1,211.53, 1,671.94 and 680.44

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Solution

The fourth proportional to 1,211.53, 1,671.94 and 680.44 is: 939.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.53 : 1,671.94 = 680.44 : x
  2. Step 2: Convert to fraction form
    1,211.53/1,671.94 = 680.44/x
  3. Step 3: Cross multiply
    1,211.53x = 1,671.94 × 680.44
  4. Step 4: Simplify right side
    1,211.53x = 1,137,654.85
  5. Step 5: Solve for x
    x = 1,137,654.85/1,211.53
  6. Step 6: Final answer
    x = 939.02

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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.