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Finding the Fourth Proportional to 1,236.19, 1,706.12 and 712.21

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Solution

The fourth proportional to 1,236.19, 1,706.12 and 712.21 is: 982.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.19 : 1,706.12 = 712.21 : x
  2. Step 2: Convert to fraction form
    1,236.19/1,706.12 = 712.21/x
  3. Step 3: Cross multiply
    1,236.19x = 1,706.12 × 712.21
  4. Step 4: Simplify right side
    1,236.19x = 1,215,115.73
  5. Step 5: Solve for x
    x = 1,215,115.73/1,236.19
  6. Step 6: Final answer
    x = 982.95

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Half scale
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Double scale
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1.5x scale

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.