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Finding the Fourth Proportional to 1,236.56, 1,708.11 and 989.60

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Solution

The fourth proportional to 1,236.56, 1,708.11 and 989.60 is: 1,366.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.56 : 1,708.11 = 989.60 : x
  2. Step 2: Convert to fraction form
    1,236.56/1,708.11 = 989.60/x
  3. Step 3: Cross multiply
    1,236.56x = 1,708.11 × 989.60
  4. Step 4: Simplify right side
    1,236.56x = 1,690,337.12
  5. Step 5: Solve for x
    x = 1,690,337.12/1,236.56
  6. Step 6: Final answer
    x = 1,366.97

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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.