Home / 20,820.21-28,732.58-11,388.78

Finding the Fourth Proportional to 20,820.21, 28,732.58 and 11,388.78

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Solution

The fourth proportional to 20,820.21, 28,732.58 and 11,388.78 is: 15,716.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.21 : 28,732.58 = 11,388.78 : x
  2. Step 2: Convert to fraction form
    20,820.21/28,732.58 = 11,388.78/x
  3. Step 3: Cross multiply
    20,820.21x = 28,732.58 × 11,388.78
  4. Step 4: Simplify right side
    20,820.21x = 327,228,975.51
  5. Step 5: Solve for x
    x = 327,228,975.51/20,820.21
  6. Step 6: Final answer
    x = 15,716.89

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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.