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Finding the Fourth Proportional to 1,236.68, 1,706.41 and 712.61

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Solution

The fourth proportional to 1,236.68, 1,706.41 and 712.61 is: 983.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.68 : 1,706.41 = 712.61 : x
  2. Step 2: Convert to fraction form
    1,236.68/1,706.41 = 712.61/x
  3. Step 3: Cross multiply
    1,236.68x = 1,706.41 × 712.61
  4. Step 4: Simplify right side
    1,236.68x = 1,216,001.27
  5. Step 5: Solve for x
    x = 1,216,001.27/1,236.68
  6. Step 6: Final answer
    x = 983.28

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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.