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Finding the Fourth Proportional to 3,561.57, 4,914.81 and 1,989.63

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Solution

The fourth proportional to 3,561.57, 4,914.81 and 1,989.63 is: 2,745.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.57 : 4,914.81 = 1,989.63 : x
  2. Step 2: Convert to fraction form
    3,561.57/4,914.81 = 1,989.63/x
  3. Step 3: Cross multiply
    3,561.57x = 4,914.81 × 1,989.63
  4. Step 4: Simplify right side
    3,561.57x = 9,778,653.42
  5. Step 5: Solve for x
    x = 9,778,653.42/3,561.57
  6. Step 6: Final answer
    x = 2,745.60

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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.