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Finding the Fourth Proportional to 3,790.80, 5,686.20 and 3,620.70

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Solution

The fourth proportional to 3,790.80, 5,686.20 and 3,620.70 is: 5,431.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,790.80 : 5,686.20 = 3,620.70 : x
  2. Step 2: Convert to fraction form
    3,790.80/5,686.20 = 3,620.70/x
  3. Step 3: Cross multiply
    3,790.80x = 5,686.20 × 3,620.70
  4. Step 4: Simplify right side
    3,790.80x = 20,588,024.34
  5. Step 5: Solve for x
    x = 20,588,024.34/3,790.80
  6. Step 6: Final answer
    x = 5,431.05

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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.