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Finding the Fourth Proportional to 13,221, 18,243.90 and 7,912.26

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Solution

The fourth proportional to 13,221, 18,243.90 and 7,912.26 is: 10,918.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221 : 18,243.90 = 7,912.26 : x
  2. Step 2: Convert to fraction form
    13,221/18,243.90 = 7,912.26/x
  3. Step 3: Cross multiply
    13,221x = 18,243.90 × 7,912.26
  4. Step 4: Simplify right side
    13,221x = 144,350,480.21
  5. Step 5: Solve for x
    x = 144,350,480.21/13,221
  6. Step 6: Final answer
    x = 10,918.27

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1.5x scale

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.