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Finding the Fourth Proportional to 12,361.38, 18,431.81 and 10,987.62

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Solution

The fourth proportional to 12,361.38, 18,431.81 and 10,987.62 is: 16,383.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,361.38 : 18,431.81 = 10,987.62 : x
  2. Step 2: Convert to fraction form
    12,361.38/18,431.81 = 10,987.62/x
  3. Step 3: Cross multiply
    12,361.38x = 18,431.81 × 10,987.62
  4. Step 4: Simplify right side
    12,361.38x = 202,521,669.25
  5. Step 5: Solve for x
    x = 202,521,669.25/12,361.38
  6. Step 6: Final answer
    x = 16,383.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.