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Finding the Fourth Proportional to 18,954.21, 28,409.20 and 14,259.11

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Solution

The fourth proportional to 18,954.21, 28,409.20 and 14,259.11 is: 21,372.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.21 : 28,409.20 = 14,259.11 : x
  2. Step 2: Convert to fraction form
    18,954.21/28,409.20 = 14,259.11/x
  3. Step 3: Cross multiply
    18,954.21x = 28,409.20 × 14,259.11
  4. Step 4: Simplify right side
    18,954.21x = 405,089,889.92
  5. Step 5: Solve for x
    x = 405,089,889.92/18,954.21
  6. Step 6: Final answer
    x = 21,372.03

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1.5x scale

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.