Home / 3,561.57-4,915.20-1,989.69

Finding the Fourth Proportional to 3,561.57, 4,915.20 and 1,989.69

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Solution

The fourth proportional to 3,561.57, 4,915.20 and 1,989.69 is: 2,745.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,561.57 : 4,915.20 = 1,989.69 : x
  2. Step 2: Convert to fraction form
    3,561.57/4,915.20 = 1,989.69/x
  3. Step 3: Cross multiply
    3,561.57x = 4,915.20 × 1,989.69
  4. Step 4: Simplify right side
    3,561.57x = 9,779,724.29
  5. Step 5: Solve for x
    x = 9,779,724.29/3,561.57
  6. Step 6: Final answer
    x = 2,745.90

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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.