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Finding the Fourth Proportional to 13,365.21, 18,447.99 and 8,649.81

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Solution

The fourth proportional to 13,365.21, 18,447.99 and 8,649.81 is: 11,939.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,365.21 : 18,447.99 = 8,649.81 : x
  2. Step 2: Convert to fraction form
    13,365.21/18,447.99 = 8,649.81/x
  3. Step 3: Cross multiply
    13,365.21x = 18,447.99 × 8,649.81
  4. Step 4: Simplify right side
    13,365.21x = 159,571,608.38
  5. Step 5: Solve for x
    x = 159,571,608.38/13,365.21
  6. Step 6: Final answer
    x = 11,939.33

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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.