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Finding the Fourth Proportional to 1,821,719.80, 2,728,205.70 and 978,412.60

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Solution

The fourth proportional to 1,821,719.80, 2,728,205.70 and 978,412.60 is: 1,465,269.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821,719.80 : 2,728,205.70 = 978,412.60 : x
  2. Step 2: Convert to fraction form
    1,821,719.80/2,728,205.70 = 978,412.60/x
  3. Step 3: Cross multiply
    1,821,719.80x = 2,728,205.70 × 978,412.60
  4. Step 4: Simplify right side
    1,821,719.80x = 2,669,310,832,271.82
  5. Step 5: Solve for x
    x = 2,669,310,832,271.82/1,821,719.80
  6. Step 6: Final answer
    x = 1,465,269.70

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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.