Home / 3,121.45-4,668.40-2,777.20

Finding the Fourth Proportional to 3,121.45, 4,668.40 and 2,777.20

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Solution

The fourth proportional to 3,121.45, 4,668.40 and 2,777.20 is: 4,153.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.45 : 4,668.40 = 2,777.20 : x
  2. Step 2: Convert to fraction form
    3,121.45/4,668.40 = 2,777.20/x
  3. Step 3: Cross multiply
    3,121.45x = 4,668.40 × 2,777.20
  4. Step 4: Simplify right side
    3,121.45x = 12,965,080.48
  5. Step 5: Solve for x
    x = 12,965,080.48/3,121.45
  6. Step 6: Final answer
    x = 4,153.54

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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.