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Finding the Fourth Proportional to 2,080.20, 3,121.74 and 782.76

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Solution

The fourth proportional to 2,080.20, 3,121.74 and 782.76 is: 1,174.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.20 : 3,121.74 = 782.76 : x
  2. Step 2: Convert to fraction form
    2,080.20/3,121.74 = 782.76/x
  3. Step 3: Cross multiply
    2,080.20x = 3,121.74 × 782.76
  4. Step 4: Simplify right side
    2,080.20x = 2,443,573.20
  5. Step 5: Solve for x
    x = 2,443,573.20/2,080.20
  6. Step 6: Final answer
    x = 1,174.68

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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.