Home / 2,081.16-3,121.60-986.40

Finding the Fourth Proportional to 2,081.16, 3,121.60 and 986.40

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Solution

The fourth proportional to 2,081.16, 3,121.60 and 986.40 is: 1,479.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,081.16 : 3,121.60 = 986.40 : x
  2. Step 2: Convert to fraction form
    2,081.16/3,121.60 = 986.40/x
  3. Step 3: Cross multiply
    2,081.16x = 3,121.60 × 986.40
  4. Step 4: Simplify right side
    2,081.16x = 3,079,146.24
  5. Step 5: Solve for x
    x = 3,079,146.24/2,081.16
  6. Step 6: Final answer
    x = 1,479.53

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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.