Home / 20,890.05-31,362.89-12,131.25

Finding the Fourth Proportional to 20,890.05, 31,362.89 and 12,131.25

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Solution

The fourth proportional to 20,890.05, 31,362.89 and 12,131.25 is: 18,213.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.05 : 31,362.89 = 12,131.25 : x
  2. Step 2: Convert to fraction form
    20,890.05/31,362.89 = 12,131.25/x
  3. Step 3: Cross multiply
    20,890.05x = 31,362.89 × 12,131.25
  4. Step 4: Simplify right side
    20,890.05x = 380,470,998.66
  5. Step 5: Solve for x
    x = 380,470,998.66/20,890.05
  6. Step 6: Final answer
    x = 18,213.02

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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.