Home / 2,122.80-2,929.65-1,238.89

Finding the Fourth Proportional to 2,122.80, 2,929.65 and 1,238.89

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Solution

The fourth proportional to 2,122.80, 2,929.65 and 1,238.89 is: 1,709.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.80 : 2,929.65 = 1,238.89 : x
  2. Step 2: Convert to fraction form
    2,122.80/2,929.65 = 1,238.89/x
  3. Step 3: Cross multiply
    2,122.80x = 2,929.65 × 1,238.89
  4. Step 4: Simplify right side
    2,122.80x = 3,629,514.58
  5. Step 5: Solve for x
    x = 3,629,514.58/2,122.80
  6. Step 6: Final answer
    x = 1,709.78

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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.