Home / 2,105.85-2,906.08-1,209.35

Finding the Fourth Proportional to 2,105.85, 2,906.08 and 1,209.35

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Solution

The fourth proportional to 2,105.85, 2,906.08 and 1,209.35 is: 1,668.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.85 : 2,906.08 = 1,209.35 : x
  2. Step 2: Convert to fraction form
    2,105.85/2,906.08 = 1,209.35/x
  3. Step 3: Cross multiply
    2,105.85x = 2,906.08 × 1,209.35
  4. Step 4: Simplify right side
    2,105.85x = 3,514,455.74
  5. Step 5: Solve for x
    x = 3,514,455.74/2,105.85
  6. Step 6: Final answer
    x = 1,668.90

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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.