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Finding the Fourth Proportional to 2,158,605.70, 2,978,797.89 and 1,191,715.54

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Solution

The fourth proportional to 2,158,605.70, 2,978,797.89 and 1,191,715.54 is: 1,644,524.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158,605.70 : 2,978,797.89 = 1,191,715.54 : x
  2. Step 2: Convert to fraction form
    2,158,605.70/2,978,797.89 = 1,191,715.54/x
  3. Step 3: Cross multiply
    2,158,605.70x = 2,978,797.89 × 1,191,715.54
  4. Step 4: Simplify right side
    2,158,605.70x = 3,549,879,736,032.21
  5. Step 5: Solve for x
    x = 3,549,879,736,032.21/2,158,605.70
  6. Step 6: Final answer
    x = 1,644,524.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.