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Finding the Fourth Proportional to 1,216.75, 1,678.35 and 843.74

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Solution

The fourth proportional to 1,216.75, 1,678.35 and 843.74 is: 1,163.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.75 : 1,678.35 = 843.74 : x
  2. Step 2: Convert to fraction form
    1,216.75/1,678.35 = 843.74/x
  3. Step 3: Cross multiply
    1,216.75x = 1,678.35 × 843.74
  4. Step 4: Simplify right side
    1,216.75x = 1,416,091.03
  5. Step 5: Solve for x
    x = 1,416,091.03/1,216.75
  6. Step 6: Final answer
    x = 1,163.83

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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.