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Finding the Fourth Proportional to 1,790.85, 2,686.61 and 620.80

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Solution

The fourth proportional to 1,790.85, 2,686.61 and 620.80 is: 931.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,790.85 : 2,686.61 = 620.80 : x
  2. Step 2: Convert to fraction form
    1,790.85/2,686.61 = 620.80/x
  3. Step 3: Cross multiply
    1,790.85x = 2,686.61 × 620.80
  4. Step 4: Simplify right side
    1,790.85x = 1,667,847.49
  5. Step 5: Solve for x
    x = 1,667,847.49/1,790.85
  6. Step 6: Final answer
    x = 931.32

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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.