Home / 1,081.20-1,621.68-311.70

Finding the Fourth Proportional to 1,081.20, 1,621.68 and 311.70

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Solution

The fourth proportional to 1,081.20, 1,621.68 and 311.70 is: 467.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.20 : 1,621.68 = 311.70 : x
  2. Step 2: Convert to fraction form
    1,081.20/1,621.68 = 311.70/x
  3. Step 3: Cross multiply
    1,081.20x = 1,621.68 × 311.70
  4. Step 4: Simplify right side
    1,081.20x = 505,477.66
  5. Step 5: Solve for x
    x = 505,477.66/1,081.20
  6. Step 6: Final answer
    x = 467.52

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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.