Home / 7,120.85-9,826.92-3,977.04

Finding the Fourth Proportional to 7,120.85, 9,826.92 and 3,977.04

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Solution

The fourth proportional to 7,120.85, 9,826.92 and 3,977.04 is: 5,488.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.85 : 9,826.92 = 3,977.04 : x
  2. Step 2: Convert to fraction form
    7,120.85/9,826.92 = 3,977.04/x
  3. Step 3: Cross multiply
    7,120.85x = 9,826.92 × 3,977.04
  4. Step 4: Simplify right side
    7,120.85x = 39,082,053.92
  5. Step 5: Solve for x
    x = 39,082,053.92/7,120.85
  6. Step 6: Final answer
    x = 5,488.40

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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.