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Finding the Fourth Proportional to 21,297.66, 31,942.08 and 20,243.94

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Solution

The fourth proportional to 21,297.66, 31,942.08 and 20,243.94 is: 30,361.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,297.66 : 31,942.08 = 20,243.94 : x
  2. Step 2: Convert to fraction form
    21,297.66/31,942.08 = 20,243.94/x
  3. Step 3: Cross multiply
    21,297.66x = 31,942.08 × 20,243.94
  4. Step 4: Simplify right side
    21,297.66x = 646,633,551.00
  5. Step 5: Solve for x
    x = 646,633,551.00/21,297.66
  6. Step 6: Final answer
    x = 30,361.72

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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.