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Finding the Fourth Proportional to 2,080.68, 3,120.96 and 619.88

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Solution

The fourth proportional to 2,080.68, 3,120.96 and 619.88 is: 929.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.68 : 3,120.96 = 619.88 : x
  2. Step 2: Convert to fraction form
    2,080.68/3,120.96 = 619.88/x
  3. Step 3: Cross multiply
    2,080.68x = 3,120.96 × 619.88
  4. Step 4: Simplify right side
    2,080.68x = 1,934,620.68
  5. Step 5: Solve for x
    x = 1,934,620.68/2,080.68
  6. Step 6: Final answer
    x = 929.80

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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.