Home / 20,790.89-31,206.05-12,869.44

Finding the Fourth Proportional to 20,790.89, 31,206.05 and 12,869.44

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Solution

The fourth proportional to 20,790.89, 31,206.05 and 12,869.44 is: 19,316.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.89 : 31,206.05 = 12,869.44 : x
  2. Step 2: Convert to fraction form
    20,790.89/31,206.05 = 12,869.44/x
  3. Step 3: Cross multiply
    20,790.89x = 31,206.05 × 12,869.44
  4. Step 4: Simplify right side
    20,790.89x = 401,604,388.11
  5. Step 5: Solve for x
    x = 401,604,388.11/20,790.89
  6. Step 6: Final answer
    x = 19,316.36

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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.