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Finding the Fourth Proportional to 18,361.80, 27,540.18 and 5,215.50

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Solution

The fourth proportional to 18,361.80, 27,540.18 and 5,215.50 is: 7,822.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.80 : 27,540.18 = 5,215.50 : x
  2. Step 2: Convert to fraction form
    18,361.80/27,540.18 = 5,215.50/x
  3. Step 3: Cross multiply
    18,361.80x = 27,540.18 × 5,215.50
  4. Step 4: Simplify right side
    18,361.80x = 143,635,808.79
  5. Step 5: Solve for x
    x = 143,635,808.79/18,361.80
  6. Step 6: Final answer
    x = 7,822.53

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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.