Home / 1,211.66-1,675.60-1,189.80

Finding the Fourth Proportional to 1,211.66, 1,675.60 and 1,189.80

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Solution

The fourth proportional to 1,211.66, 1,675.60 and 1,189.80 is: 1,645.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.66 : 1,675.60 = 1,189.80 : x
  2. Step 2: Convert to fraction form
    1,211.66/1,675.60 = 1,189.80/x
  3. Step 3: Cross multiply
    1,211.66x = 1,675.60 × 1,189.80
  4. Step 4: Simplify right side
    1,211.66x = 1,993,628.88
  5. Step 5: Solve for x
    x = 1,993,628.88/1,211.66
  6. Step 6: Final answer
    x = 1,645.37

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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.