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Finding the Fourth Proportional to 19,371.50, 26,720.19 and 11,919.98

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Solution

The fourth proportional to 19,371.50, 26,720.19 and 11,919.98 is: 16,441.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,371.50 : 26,720.19 = 11,919.98 : x
  2. Step 2: Convert to fraction form
    19,371.50/26,720.19 = 11,919.98/x
  3. Step 3: Cross multiply
    19,371.50x = 26,720.19 × 11,919.98
  4. Step 4: Simplify right side
    19,371.50x = 318,504,130.40
  5. Step 5: Solve for x
    x = 318,504,130.40/19,371.50
  6. Step 6: Final answer
    x = 16,441.89

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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.