Home / 1,290.11-1,922.48-1,212.20

Finding the Fourth Proportional to 1,290.11, 1,922.48 and 1,212.20

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Solution

The fourth proportional to 1,290.11, 1,922.48 and 1,212.20 is: 1,806.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.11 : 1,922.48 = 1,212.20 : x
  2. Step 2: Convert to fraction form
    1,290.11/1,922.48 = 1,212.20/x
  3. Step 3: Cross multiply
    1,290.11x = 1,922.48 × 1,212.20
  4. Step 4: Simplify right side
    1,290.11x = 2,330,414.58
  5. Step 5: Solve for x
    x = 2,330,414.58/1,290.11
  6. Step 6: Final answer
    x = 1,806.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.