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Finding the Fourth Proportional to 1,236.09, 1,705.72 and 712.11

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Solution

The fourth proportional to 1,236.09, 1,705.72 and 712.11 is: 982.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.09 : 1,705.72 = 712.11 : x
  2. Step 2: Convert to fraction form
    1,236.09/1,705.72 = 712.11/x
  3. Step 3: Cross multiply
    1,236.09x = 1,705.72 × 712.11
  4. Step 4: Simplify right side
    1,236.09x = 1,214,660.27
  5. Step 5: Solve for x
    x = 1,214,660.27/1,236.09
  6. Step 6: Final answer
    x = 982.66

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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.