Home / 1,389.18-2,082.41-694.81

Finding the Fourth Proportional to 1,389.18, 2,082.41 and 694.81

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Solution

The fourth proportional to 1,389.18, 2,082.41 and 694.81 is: 1,041.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.18 : 2,082.41 = 694.81 : x
  2. Step 2: Convert to fraction form
    1,389.18/2,082.41 = 694.81/x
  3. Step 3: Cross multiply
    1,389.18x = 2,082.41 × 694.81
  4. Step 4: Simplify right side
    1,389.18x = 1,446,879.29
  5. Step 5: Solve for x
    x = 1,446,879.29/1,389.18
  6. Step 6: Final answer
    x = 1,041.53

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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.