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Finding the Fourth Proportional to 1,236.75, 1,706.72 and 684.75

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Solution

The fourth proportional to 1,236.75, 1,706.72 and 684.75 is: 944.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.75 : 1,706.72 = 684.75 : x
  2. Step 2: Convert to fraction form
    1,236.75/1,706.72 = 684.75/x
  3. Step 3: Cross multiply
    1,236.75x = 1,706.72 × 684.75
  4. Step 4: Simplify right side
    1,236.75x = 1,168,676.52
  5. Step 5: Solve for x
    x = 1,168,676.52/1,236.75
  6. Step 6: Final answer
    x = 944.96

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,237.75, 1,708.10 and 685.75
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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.