Home / 7,120.90-9,826.68-3,977.09

Finding the Fourth Proportional to 7,120.90, 9,826.68 and 3,977.09

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Solution

The fourth proportional to 7,120.90, 9,826.68 and 3,977.09 is: 5,488.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.90 : 9,826.68 = 3,977.09 : x
  2. Step 2: Convert to fraction form
    7,120.90/9,826.68 = 3,977.09/x
  3. Step 3: Cross multiply
    7,120.90x = 9,826.68 × 3,977.09
  4. Step 4: Simplify right side
    7,120.90x = 39,081,590.76
  5. Step 5: Solve for x
    x = 39,081,590.76/7,120.90
  6. Step 6: Final answer
    x = 5,488.29

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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.