Home / 2,085.21-3,121.28-1,157.80

Finding the Fourth Proportional to 2,085.21, 3,121.28 and 1,157.80

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Solution

The fourth proportional to 2,085.21, 3,121.28 and 1,157.80 is: 1,733.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.21 : 3,121.28 = 1,157.80 : x
  2. Step 2: Convert to fraction form
    2,085.21/3,121.28 = 1,157.80/x
  3. Step 3: Cross multiply
    2,085.21x = 3,121.28 × 1,157.80
  4. Step 4: Simplify right side
    2,085.21x = 3,613,817.98
  5. Step 5: Solve for x
    x = 3,613,817.98/2,085.21
  6. Step 6: Final answer
    x = 1,733.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.