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Finding the Fourth Proportional to 19,920.72, 27,489.51 and 11,422.43

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Solution

The fourth proportional to 19,920.72, 27,489.51 and 11,422.43 is: 15,762.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.72 : 27,489.51 = 11,422.43 : x
  2. Step 2: Convert to fraction form
    19,920.72/27,489.51 = 11,422.43/x
  3. Step 3: Cross multiply
    19,920.72x = 27,489.51 × 11,422.43
  4. Step 4: Simplify right side
    19,920.72x = 313,996,866.26
  5. Step 5: Solve for x
    x = 313,996,866.26/19,920.72
  6. Step 6: Final answer
    x = 15,762.33

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.