Home / 20,815.56-31,183.86-12,364.20

Finding the Fourth Proportional to 20,815.56, 31,183.86 and 12,364.20

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Solution

The fourth proportional to 20,815.56, 31,183.86 and 12,364.20 is: 18,522.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.56 : 31,183.86 = 12,364.20 : x
  2. Step 2: Convert to fraction form
    20,815.56/31,183.86 = 12,364.20/x
  3. Step 3: Cross multiply
    20,815.56x = 31,183.86 × 12,364.20
  4. Step 4: Simplify right side
    20,815.56x = 385,563,481.81
  5. Step 5: Solve for x
    x = 385,563,481.81/20,815.56
  6. Step 6: Final answer
    x = 18,522.85

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1.5x scale

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.