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Finding the Fourth Proportional to 20,580.40, 30,919.80 and 13,199.32

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Solution

The fourth proportional to 20,580.40, 30,919.80 and 13,199.32 is: 19,830.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.40 : 30,919.80 = 13,199.32 : x
  2. Step 2: Convert to fraction form
    20,580.40/30,919.80 = 13,199.32/x
  3. Step 3: Cross multiply
    20,580.40x = 30,919.80 × 13,199.32
  4. Step 4: Simplify right side
    20,580.40x = 408,120,334.54
  5. Step 5: Solve for x
    x = 408,120,334.54/20,580.40
  6. Step 6: Final answer
    x = 19,830.53

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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.