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Finding the Fourth Proportional to 1,259,890.20, 1,891,803.60 and 728,449.20

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Solution

The fourth proportional to 1,259,890.20, 1,891,803.60 and 728,449.20 is: 1,093,811.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259,890.20 : 1,891,803.60 = 728,449.20 : x
  2. Step 2: Convert to fraction form
    1,259,890.20/1,891,803.60 = 728,449.20/x
  3. Step 3: Cross multiply
    1,259,890.20x = 1,891,803.60 × 728,449.20
  4. Step 4: Simplify right side
    1,259,890.20x = 1,378,082,818,977.12
  5. Step 5: Solve for x
    x = 1,378,082,818,977.12/1,259,890.20
  6. Step 6: Final answer
    x = 1,093,811.84

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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.