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Finding the Fourth Proportional to 69,986, 104,999.48 and 20,739.28

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Solution

The fourth proportional to 69,986, 104,999.48 and 20,739.28 is: 31,114.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,986 : 104,999.48 = 20,739.28 : x
  2. Step 2: Convert to fraction form
    69,986/104,999.48 = 20,739.28/x
  3. Step 3: Cross multiply
    69,986x = 104,999.48 × 20,739.28
  4. Step 4: Simplify right side
    69,986x = 2,177,613,615.57
  5. Step 5: Solve for x
    x = 2,177,613,615.57/69,986
  6. Step 6: Final answer
    x = 31,114.99

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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.