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Finding the Fourth Proportional to 1,211.82, 1,671.15 and 768.93

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Solution

The fourth proportional to 1,211.82, 1,671.15 and 768.93 is: 1,060.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.82 : 1,671.15 = 768.93 : x
  2. Step 2: Convert to fraction form
    1,211.82/1,671.15 = 768.93/x
  3. Step 3: Cross multiply
    1,211.82x = 1,671.15 × 768.93
  4. Step 4: Simplify right side
    1,211.82x = 1,284,997.37
  5. Step 5: Solve for x
    x = 1,284,997.37/1,211.82
  6. Step 6: Final answer
    x = 1,060.39

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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.