Home / 2,208.78-3,313.20-669.78

Finding the Fourth Proportional to 2,208.78, 3,313.20 and 669.78

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Solution

The fourth proportional to 2,208.78, 3,313.20 and 669.78 is: 1,004.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,208.78 : 3,313.20 = 669.78 : x
  2. Step 2: Convert to fraction form
    2,208.78/3,313.20 = 669.78/x
  3. Step 3: Cross multiply
    2,208.78x = 3,313.20 × 669.78
  4. Step 4: Simplify right side
    2,208.78x = 2,219,115.10
  5. Step 5: Solve for x
    x = 2,219,115.10/2,208.78
  6. Step 6: Final answer
    x = 1,004.68

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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.