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Finding the Fourth Proportional to 20,669.75, 31,004.64 and 6,818.75

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Solution

The fourth proportional to 20,669.75, 31,004.64 and 6,818.75 is: 10,228.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,669.75 : 31,004.64 = 6,818.75 : x
  2. Step 2: Convert to fraction form
    20,669.75/31,004.64 = 6,818.75/x
  3. Step 3: Cross multiply
    20,669.75x = 31,004.64 × 6,818.75
  4. Step 4: Simplify right side
    20,669.75x = 211,412,889
  5. Step 5: Solve for x
    x = 211,412,889/20,669.75
  6. Step 6: Final answer
    x = 10,228.13

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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.