Home / 20,986.85-28,961.19-12,487.03

Finding the Fourth Proportional to 20,986.85, 28,961.19 and 12,487.03

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Solution

The fourth proportional to 20,986.85, 28,961.19 and 12,487.03 is: 17,231.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.85 : 28,961.19 = 12,487.03 : x
  2. Step 2: Convert to fraction form
    20,986.85/28,961.19 = 12,487.03/x
  3. Step 3: Cross multiply
    20,986.85x = 28,961.19 × 12,487.03
  4. Step 4: Simplify right side
    20,986.85x = 361,639,175.96
  5. Step 5: Solve for x
    x = 361,639,175.96/20,986.85
  6. Step 6: Final answer
    x = 17,231.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.