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Finding the Fourth Proportional to 1,112.37, 1,668.20 and 371.82

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Solution

The fourth proportional to 1,112.37, 1,668.20 and 371.82 is: 557.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.37 : 1,668.20 = 371.82 : x
  2. Step 2: Convert to fraction form
    1,112.37/1,668.20 = 371.82/x
  3. Step 3: Cross multiply
    1,112.37x = 1,668.20 × 371.82
  4. Step 4: Simplify right side
    1,112.37x = 620,268.26
  5. Step 5: Solve for x
    x = 620,268.26/1,112.37
  6. Step 6: Final answer
    x = 557.61

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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.