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Finding the Fourth Proportional to 3,561.70, 4,914.84 and 1,989.88

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Solution

The fourth proportional to 3,561.70, 4,914.84 and 1,989.88 is: 2,745.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.70 : 4,914.84 = 1,989.88 : x
  2. Step 2: Convert to fraction form
    3,561.70/4,914.84 = 1,989.88/x
  3. Step 3: Cross multiply
    3,561.70x = 4,914.84 × 1,989.88
  4. Step 4: Simplify right side
    3,561.70x = 9,779,941.82
  5. Step 5: Solve for x
    x = 9,779,941.82/3,561.70
  6. Step 6: Final answer
    x = 2,745.86

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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.