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Finding the Fourth Proportional to 3,561.89, 4,914.95 and 1,989.86

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Solution

The fourth proportional to 3,561.89, 4,914.95 and 1,989.86 is: 2,745.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.89 : 4,914.95 = 1,989.86 : x
  2. Step 2: Convert to fraction form
    3,561.89/4,914.95 = 1,989.86/x
  3. Step 3: Cross multiply
    3,561.89x = 4,914.95 × 1,989.86
  4. Step 4: Simplify right side
    3,561.89x = 9,780,027.88
  5. Step 5: Solve for x
    x = 9,780,027.88/3,561.89
  6. Step 6: Final answer
    x = 2,745.74

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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.