Home / 12,309.96-18,467.58-3,990.78

Finding the Fourth Proportional to 12,309.96, 18,467.58 and 3,990.78

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Solution

The fourth proportional to 12,309.96, 18,467.58 and 3,990.78 is: 5,987.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.96 : 18,467.58 = 3,990.78 : x
  2. Step 2: Convert to fraction form
    12,309.96/18,467.58 = 3,990.78/x
  3. Step 3: Cross multiply
    12,309.96x = 18,467.58 × 3,990.78
  4. Step 4: Simplify right side
    12,309.96x = 73,700,048.91
  5. Step 5: Solve for x
    x = 73,700,048.91/12,309.96
  6. Step 6: Final answer
    x = 5,987.03

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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.