Home / 12,989.12-19,469.64-5,189.36

Finding the Fourth Proportional to 12,989.12, 19,469.64 and 5,189.36

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Solution

The fourth proportional to 12,989.12, 19,469.64 and 5,189.36 is: 7,778.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989.12 : 19,469.64 = 5,189.36 : x
  2. Step 2: Convert to fraction form
    12,989.12/19,469.64 = 5,189.36/x
  3. Step 3: Cross multiply
    12,989.12x = 19,469.64 × 5,189.36
  4. Step 4: Simplify right side
    12,989.12x = 101,034,971.03
  5. Step 5: Solve for x
    x = 101,034,971.03/12,989.12
  6. Step 6: Final answer
    x = 7,778.43

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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.