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Finding the Fourth Proportional to 1,272.11, 1,906.94 and 860.22

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Solution

The fourth proportional to 1,272.11, 1,906.94 and 860.22 is: 1,289.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.11 : 1,906.94 = 860.22 : x
  2. Step 2: Convert to fraction form
    1,272.11/1,906.94 = 860.22/x
  3. Step 3: Cross multiply
    1,272.11x = 1,906.94 × 860.22
  4. Step 4: Simplify right side
    1,272.11x = 1,640,390.08
  5. Step 5: Solve for x
    x = 1,640,390.08/1,272.11
  6. Step 6: Final answer
    x = 1,289.51

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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.