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Finding the Fourth Proportional to 3,011.94, 4,517.45 and 820.85

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Solution

The fourth proportional to 3,011.94, 4,517.45 and 820.85 is: 1,231.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,011.94 : 4,517.45 = 820.85 : x
  2. Step 2: Convert to fraction form
    3,011.94/4,517.45 = 820.85/x
  3. Step 3: Cross multiply
    3,011.94x = 4,517.45 × 820.85
  4. Step 4: Simplify right side
    3,011.94x = 3,708,122.14
  5. Step 5: Solve for x
    x = 3,708,122.14/3,011.94
  6. Step 6: Final answer
    x = 1,231.14

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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.