Home / 20,289.16-27,997.86-11,905

Finding the Fourth Proportional to 20,289.16, 27,997.86 and 11,905

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Solution

The fourth proportional to 20,289.16, 27,997.86 and 11,905 is: 16,428.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,289.16 : 27,997.86 = 11,905 : x
  2. Step 2: Convert to fraction form
    20,289.16/27,997.86 = 11,905/x
  3. Step 3: Cross multiply
    20,289.16x = 27,997.86 × 11,905
  4. Step 4: Simplify right side
    20,289.16x = 333,314,523.30
  5. Step 5: Solve for x
    x = 333,314,523.30/20,289.16
  6. Step 6: Final answer
    x = 16,428.21

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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.