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Finding the Fourth Proportional to 1,409.90, 2,112.16 and 791.73

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Solution

The fourth proportional to 1,409.90, 2,112.16 and 791.73 is: 1,186.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.90 : 2,112.16 = 791.73 : x
  2. Step 2: Convert to fraction form
    1,409.90/2,112.16 = 791.73/x
  3. Step 3: Cross multiply
    1,409.90x = 2,112.16 × 791.73
  4. Step 4: Simplify right side
    1,409.90x = 1,672,260.44
  5. Step 5: Solve for x
    x = 1,672,260.44/1,409.90
  6. Step 6: Final answer
    x = 1,186.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.