Home / 2,151.21-3,226.83-690.36

Finding the Fourth Proportional to 2,151.21, 3,226.83 and 690.36

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Solution

The fourth proportional to 2,151.21, 3,226.83 and 690.36 is: 1,035.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.21 : 3,226.83 = 690.36 : x
  2. Step 2: Convert to fraction form
    2,151.21/3,226.83 = 690.36/x
  3. Step 3: Cross multiply
    2,151.21x = 3,226.83 × 690.36
  4. Step 4: Simplify right side
    2,151.21x = 2,227,674.36
  5. Step 5: Solve for x
    x = 2,227,674.36/2,151.21
  6. Step 6: Final answer
    x = 1,035.54

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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.