Home / 12,540.72-18,811.44-6,990.96

Finding the Fourth Proportional to 12,540.72, 18,811.44 and 6,990.96

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Solution

The fourth proportional to 12,540.72, 18,811.44 and 6,990.96 is: 10,486.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,540.72 : 18,811.44 = 6,990.96 : x
  2. Step 2: Convert to fraction form
    12,540.72/18,811.44 = 6,990.96/x
  3. Step 3: Cross multiply
    12,540.72x = 18,811.44 × 6,990.96
  4. Step 4: Simplify right side
    12,540.72x = 131,510,024.58
  5. Step 5: Solve for x
    x = 131,510,024.58/12,540.72
  6. Step 6: Final answer
    x = 10,486.64

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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.