Home / 2,621.20-3,931.80-1,085.20

Finding the Fourth Proportional to 2,621.20, 3,931.80 and 1,085.20

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Solution

The fourth proportional to 2,621.20, 3,931.80 and 1,085.20 is: 1,627.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,621.20 : 3,931.80 = 1,085.20 : x
  2. Step 2: Convert to fraction form
    2,621.20/3,931.80 = 1,085.20/x
  3. Step 3: Cross multiply
    2,621.20x = 3,931.80 × 1,085.20
  4. Step 4: Simplify right side
    2,621.20x = 4,266,789.36
  5. Step 5: Solve for x
    x = 4,266,789.36/2,621.20
  6. Step 6: Final answer
    x = 1,627.80

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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.