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Finding the Fourth Proportional to 20,999.97, 28,980.50 and 11,440.19

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Solution

The fourth proportional to 20,999.97, 28,980.50 and 11,440.19 is: 15,787.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.97 : 28,980.50 = 11,440.19 : x
  2. Step 2: Convert to fraction form
    20,999.97/28,980.50 = 11,440.19/x
  3. Step 3: Cross multiply
    20,999.97x = 28,980.50 × 11,440.19
  4. Step 4: Simplify right side
    20,999.97x = 331,542,224.19
  5. Step 5: Solve for x
    x = 331,542,224.19/20,999.97
  6. Step 6: Final answer
    x = 15,787.75

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1.5x scale

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.