Home / 3,911.55-5,392.35-2,790.57

Finding the Fourth Proportional to 3,911.55, 5,392.35 and 2,790.57

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Solution

The fourth proportional to 3,911.55, 5,392.35 and 2,790.57 is: 3,847.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.55 : 5,392.35 = 2,790.57 : x
  2. Step 2: Convert to fraction form
    3,911.55/5,392.35 = 2,790.57/x
  3. Step 3: Cross multiply
    3,911.55x = 5,392.35 × 2,790.57
  4. Step 4: Simplify right side
    3,911.55x = 15,047,730.14
  5. Step 5: Solve for x
    x = 15,047,730.14/3,911.55
  6. Step 6: Final answer
    x = 3,847.00

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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.