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Finding the Fourth Proportional to 20,112, 27,755.04 and 11,280

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Solution

The fourth proportional to 20,112, 27,755.04 and 11,280 is: 15,566.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,112 : 27,755.04 = 11,280 : x
  2. Step 2: Convert to fraction form
    20,112/27,755.04 = 11,280/x
  3. Step 3: Cross multiply
    20,112x = 27,755.04 × 11,280
  4. Step 4: Simplify right side
    20,112x = 313,076,851.20
  5. Step 5: Solve for x
    x = 313,076,851.20/20,112
  6. Step 6: Final answer
    x = 15,566.67

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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.