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Finding the Fourth Proportional to 20,816.50, 31,224.78 and 8,504.50

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Solution

The fourth proportional to 20,816.50, 31,224.78 and 8,504.50 is: 12,756.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.50 : 31,224.78 = 8,504.50 : x
  2. Step 2: Convert to fraction form
    20,816.50/31,224.78 = 8,504.50/x
  3. Step 3: Cross multiply
    20,816.50x = 31,224.78 × 8,504.50
  4. Step 4: Simplify right side
    20,816.50x = 265,551,141.51
  5. Step 5: Solve for x
    x = 265,551,141.51/20,816.50
  6. Step 6: Final answer
    x = 12,756.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.