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Finding the Fourth Proportional to 20,994.75, 28,972.76 and 11,563.31

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Solution

The fourth proportional to 20,994.75, 28,972.76 and 11,563.31 is: 15,957.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.75 : 28,972.76 = 11,563.31 : x
  2. Step 2: Convert to fraction form
    20,994.75/28,972.76 = 11,563.31/x
  3. Step 3: Cross multiply
    20,994.75x = 28,972.76 × 11,563.31
  4. Step 4: Simplify right side
    20,994.75x = 335,021,020.05
  5. Step 5: Solve for x
    x = 335,021,020.05/20,994.75
  6. Step 6: Final answer
    x = 15,957.37

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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.