Home / 20,989.14-28,956.32-12,489.56

Finding the Fourth Proportional to 20,989.14, 28,956.32 and 12,489.56

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Solution

The fourth proportional to 20,989.14, 28,956.32 and 12,489.56 is: 17,230.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.14 : 28,956.32 = 12,489.56 : x
  2. Step 2: Convert to fraction form
    20,989.14/28,956.32 = 12,489.56/x
  3. Step 3: Cross multiply
    20,989.14x = 28,956.32 × 12,489.56
  4. Step 4: Simplify right side
    20,989.14x = 361,651,696.02
  5. Step 5: Solve for x
    x = 361,651,696.02/20,989.14
  6. Step 6: Final answer
    x = 17,230.42

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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.