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Finding the Fourth Proportional to 3,978,766.13, 5,490,697.31 and 2,167,930.13

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Solution

The fourth proportional to 3,978,766.13, 5,490,697.31 and 2,167,930.13 is: 2,991,743.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978,766.13 : 5,490,697.31 = 2,167,930.13 : x
  2. Step 2: Convert to fraction form
    3,978,766.13/5,490,697.31 = 2,167,930.13/x
  3. Step 3: Cross multiply
    3,978,766.13x = 5,490,697.31 × 2,167,930.13
  4. Step 4: Simplify right side
    3,978,766.13x = 11,903,448,094,765.81
  5. Step 5: Solve for x
    x = 11,903,448,094,765.81/3,978,766.13
  6. Step 6: Final answer
    x = 2,991,743.60

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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.