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Finding the Fourth Proportional to 2,080.79, 3,121.28 and 620.05

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Solution

The fourth proportional to 2,080.79, 3,121.28 and 620.05 is: 930.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.79 : 3,121.28 = 620.05 : x
  2. Step 2: Convert to fraction form
    2,080.79/3,121.28 = 620.05/x
  3. Step 3: Cross multiply
    2,080.79x = 3,121.28 × 620.05
  4. Step 4: Simplify right side
    2,080.79x = 1,935,346.56
  5. Step 5: Solve for x
    x = 1,935,346.56/2,080.79
  6. Step 6: Final answer
    x = 930.10

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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.