Home / 12,540.64-18,811.90-4,220.68

Finding the Fourth Proportional to 12,540.64, 18,811.90 and 4,220.68

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Solution

The fourth proportional to 12,540.64, 18,811.90 and 4,220.68 is: 6,331.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,540.64 : 18,811.90 = 4,220.68 : x
  2. Step 2: Convert to fraction form
    12,540.64/18,811.90 = 4,220.68/x
  3. Step 3: Cross multiply
    12,540.64x = 18,811.90 × 4,220.68
  4. Step 4: Simplify right side
    12,540.64x = 79,399,010.09
  5. Step 5: Solve for x
    x = 79,399,010.09/12,540.64
  6. Step 6: Final answer
    x = 6,331.34

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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.