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Finding the Fourth Proportional to 18,361.80, 25,301.70 and 15,186.60

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Solution

The fourth proportional to 18,361.80, 25,301.70 and 15,186.60 is: 20,926.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.80 : 25,301.70 = 15,186.60 : x
  2. Step 2: Convert to fraction form
    18,361.80/25,301.70 = 15,186.60/x
  3. Step 3: Cross multiply
    18,361.80x = 25,301.70 × 15,186.60
  4. Step 4: Simplify right side
    18,361.80x = 384,246,797.22
  5. Step 5: Solve for x
    x = 384,246,797.22/18,361.80
  6. Step 6: Final answer
    x = 20,926.42

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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.