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Finding the Fourth Proportional to 3,561.12, 4,914.53 and 1,989.12

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Solution

The fourth proportional to 3,561.12, 4,914.53 and 1,989.12 is: 2,745.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.12 : 4,914.53 = 1,989.12 : x
  2. Step 2: Convert to fraction form
    3,561.12/4,914.53 = 1,989.12/x
  3. Step 3: Cross multiply
    3,561.12x = 4,914.53 × 1,989.12
  4. Step 4: Simplify right side
    3,561.12x = 9,775,589.91
  5. Step 5: Solve for x
    x = 9,775,589.91/3,561.12
  6. Step 6: Final answer
    x = 2,745.09

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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.