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Finding the Fourth Proportional to 2,647.75, 3,971.63 and 823.75

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Solution

The fourth proportional to 2,647.75, 3,971.63 and 823.75 is: 1,235.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.75 : 3,971.63 = 823.75 : x
  2. Step 2: Convert to fraction form
    2,647.75/3,971.63 = 823.75/x
  3. Step 3: Cross multiply
    2,647.75x = 3,971.63 × 823.75
  4. Step 4: Simplify right side
    2,647.75x = 3,271,630.21
  5. Step 5: Solve for x
    x = 3,271,630.21/2,647.75
  6. Step 6: Final answer
    x = 1,235.63

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Half scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.