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Finding the Fourth Proportional to 111,268.80, 166,676.40 and 69,019.20

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Solution

The fourth proportional to 111,268.80, 166,676.40 and 69,019.20 is: 103,388.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,268.80 : 166,676.40 = 69,019.20 : x
  2. Step 2: Convert to fraction form
    111,268.80/166,676.40 = 69,019.20/x
  3. Step 3: Cross multiply
    111,268.80x = 166,676.40 × 69,019.20
  4. Step 4: Simplify right side
    111,268.80x = 11,503,871,786.88
  5. Step 5: Solve for x
    x = 11,503,871,786.88/111,268.80
  6. Step 6: Final answer
    x = 103,388.12

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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.