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Finding the Fourth Proportional to 2,085.96, 3,128.99 and 990.44

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Solution

The fourth proportional to 2,085.96, 3,128.99 and 990.44 is: 1,485.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.96 : 3,128.99 = 990.44 : x
  2. Step 2: Convert to fraction form
    2,085.96/3,128.99 = 990.44/x
  3. Step 3: Cross multiply
    2,085.96x = 3,128.99 × 990.44
  4. Step 4: Simplify right side
    2,085.96x = 3,099,056.26
  5. Step 5: Solve for x
    x = 3,099,056.26/2,085.96
  6. Step 6: Final answer
    x = 1,485.67

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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.