Home / 20,931.87-28,869.27-13,769.14

Finding the Fourth Proportional to 20,931.87, 28,869.27 and 13,769.14

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Solution

The fourth proportional to 20,931.87, 28,869.27 and 13,769.14 is: 18,990.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.87 : 28,869.27 = 13,769.14 : x
  2. Step 2: Convert to fraction form
    20,931.87/28,869.27 = 13,769.14/x
  3. Step 3: Cross multiply
    20,931.87x = 28,869.27 × 13,769.14
  4. Step 4: Simplify right side
    20,931.87x = 397,505,020.33
  5. Step 5: Solve for x
    x = 397,505,020.33/20,931.87
  6. Step 6: Final answer
    x = 18,990.42

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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.