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Finding the Fourth Proportional to 1,389.05, 2,082.21 and 694.68

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Solution

The fourth proportional to 1,389.05, 2,082.21 and 694.68 is: 1,041.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.05 : 2,082.21 = 694.68 : x
  2. Step 2: Convert to fraction form
    1,389.05/2,082.21 = 694.68/x
  3. Step 3: Cross multiply
    1,389.05x = 2,082.21 × 694.68
  4. Step 4: Simplify right side
    1,389.05x = 1,446,469.64
  5. Step 5: Solve for x
    x = 1,446,469.64/1,389.05
  6. Step 6: Final answer
    x = 1,041.34

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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.