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Finding the Fourth Proportional to 18,720.21, 25,824.56 and 11,161.21

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Solution

The fourth proportional to 18,720.21, 25,824.56 and 11,161.21 is: 15,396.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.21 : 25,824.56 = 11,161.21 : x
  2. Step 2: Convert to fraction form
    18,720.21/25,824.56 = 11,161.21/x
  3. Step 3: Cross multiply
    18,720.21x = 25,824.56 × 11,161.21
  4. Step 4: Simplify right side
    18,720.21x = 288,233,337.32
  5. Step 5: Solve for x
    x = 288,233,337.32/18,720.21
  6. Step 6: Final answer
    x = 15,396.91

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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.