Home / 20,580.89-30,800.25-12,680.35

Finding the Fourth Proportional to 20,580.89, 30,800.25 and 12,680.35

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Solution

The fourth proportional to 20,580.89, 30,800.25 and 12,680.35 is: 18,976.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.89 : 30,800.25 = 12,680.35 : x
  2. Step 2: Convert to fraction form
    20,580.89/30,800.25 = 12,680.35/x
  3. Step 3: Cross multiply
    20,580.89x = 30,800.25 × 12,680.35
  4. Step 4: Simplify right side
    20,580.89x = 390,557,873.09
  5. Step 5: Solve for x
    x = 390,557,873.09/20,580.89
  6. Step 6: Final answer
    x = 18,976.73

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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.