Home / 1,389.06-2,082.60-979.02

Finding the Fourth Proportional to 1,389.06, 2,082.60 and 979.02

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Solution

The fourth proportional to 1,389.06, 2,082.60 and 979.02 is: 1,467.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.06 : 2,082.60 = 979.02 : x
  2. Step 2: Convert to fraction form
    1,389.06/2,082.60 = 979.02/x
  3. Step 3: Cross multiply
    1,389.06x = 2,082.60 × 979.02
  4. Step 4: Simplify right side
    1,389.06x = 2,038,907.05
  5. Step 5: Solve for x
    x = 2,038,907.05/1,389.06
  6. Step 6: Final answer
    x = 1,467.83

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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.