Home / 20,720.78-31,080.94-12,403.11

Finding the Fourth Proportional to 20,720.78, 31,080.94 and 12,403.11

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Solution

The fourth proportional to 20,720.78, 31,080.94 and 12,403.11 is: 18,604.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.78 : 31,080.94 = 12,403.11 : x
  2. Step 2: Convert to fraction form
    20,720.78/31,080.94 = 12,403.11/x
  3. Step 3: Cross multiply
    20,720.78x = 31,080.94 × 12,403.11
  4. Step 4: Simplify right side
    20,720.78x = 385,500,317.72
  5. Step 5: Solve for x
    x = 385,500,317.72/20,720.78
  6. Step 6: Final answer
    x = 18,604.53

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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.