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Finding the Fourth Proportional to 3,690.88, 5,115.40 and 3,621.76

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Solution

The fourth proportional to 3,690.88, 5,115.40 and 3,621.76 is: 5,019.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,690.88 : 5,115.40 = 3,621.76 : x
  2. Step 2: Convert to fraction form
    3,690.88/5,115.40 = 3,621.76/x
  3. Step 3: Cross multiply
    3,690.88x = 5,115.40 × 3,621.76
  4. Step 4: Simplify right side
    3,690.88x = 18,526,751.10
  5. Step 5: Solve for x
    x = 18,526,751.10/3,690.88
  6. Step 6: Final answer
    x = 5,019.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.