Home / 1,389.25-2,082.12-1,215.52

Finding the Fourth Proportional to 1,389.25, 2,082.12 and 1,215.52

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Solution

The fourth proportional to 1,389.25, 2,082.12 and 1,215.52 is: 1,821.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.25 : 2,082.12 = 1,215.52 : x
  2. Step 2: Convert to fraction form
    1,389.25/2,082.12 = 1,215.52/x
  3. Step 3: Cross multiply
    1,389.25x = 2,082.12 × 1,215.52
  4. Step 4: Simplify right side
    1,389.25x = 2,530,858.50
  5. Step 5: Solve for x
    x = 2,530,858.50/1,389.25
  6. Step 6: Final answer
    x = 1,821.74

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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.