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Finding the Fourth Proportional to 1,211.23, 1,671.01 and 791.45

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Solution

The fourth proportional to 1,211.23, 1,671.01 and 791.45 is: 1,091.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.23 : 1,671.01 = 791.45 : x
  2. Step 2: Convert to fraction form
    1,211.23/1,671.01 = 791.45/x
  3. Step 3: Cross multiply
    1,211.23x = 1,671.01 × 791.45
  4. Step 4: Simplify right side
    1,211.23x = 1,322,520.86
  5. Step 5: Solve for x
    x = 1,322,520.86/1,211.23
  6. Step 6: Final answer
    x = 1,091.88

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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.