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Finding the Fourth Proportional to 20,640.45, 30,964.98 and 9,390.45

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Solution

The fourth proportional to 20,640.45, 30,964.98 and 9,390.45 is: 14,087.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.45 : 30,964.98 = 9,390.45 : x
  2. Step 2: Convert to fraction form
    20,640.45/30,964.98 = 9,390.45/x
  3. Step 3: Cross multiply
    20,640.45x = 30,964.98 × 9,390.45
  4. Step 4: Simplify right side
    20,640.45x = 290,775,096.44
  5. Step 5: Solve for x
    x = 290,775,096.44/20,640.45
  6. Step 6: Final answer
    x = 14,087.63

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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.