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Finding the Fourth Proportional to 1,371.76, 1,893.22 and 812.48

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Solution

The fourth proportional to 1,371.76, 1,893.22 and 812.48 is: 1,121.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.76 : 1,893.22 = 812.48 : x
  2. Step 2: Convert to fraction form
    1,371.76/1,893.22 = 812.48/x
  3. Step 3: Cross multiply
    1,371.76x = 1,893.22 × 812.48
  4. Step 4: Simplify right side
    1,371.76x = 1,538,203.39
  5. Step 5: Solve for x
    x = 1,538,203.39/1,371.76
  6. Step 6: Final answer
    x = 1,121.34

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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.