Home / 20,908.80-31,353.12-12,146.22

Finding the Fourth Proportional to 20,908.80, 31,353.12 and 12,146.22

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Solution

The fourth proportional to 20,908.80, 31,353.12 and 12,146.22 is: 18,213.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.80 : 31,353.12 = 12,146.22 : x
  2. Step 2: Convert to fraction form
    20,908.80/31,353.12 = 12,146.22/x
  3. Step 3: Cross multiply
    20,908.80x = 31,353.12 × 12,146.22
  4. Step 4: Simplify right side
    20,908.80x = 380,821,893.21
  5. Step 5: Solve for x
    x = 380,821,893.21/20,908.80
  6. Step 6: Final answer
    x = 18,213.47

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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.