Home / 20,996.80-28,975.14-11,436.79

Finding the Fourth Proportional to 20,996.80, 28,975.14 and 11,436.79

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Solution

The fourth proportional to 20,996.80, 28,975.14 and 11,436.79 is: 15,782.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,996.80 : 28,975.14 = 11,436.79 : x
  2. Step 2: Convert to fraction form
    20,996.80/28,975.14 = 11,436.79/x
  3. Step 3: Cross multiply
    20,996.80x = 28,975.14 × 11,436.79
  4. Step 4: Simplify right side
    20,996.80x = 331,382,518.96
  5. Step 5: Solve for x
    x = 331,382,518.96/20,996.80
  6. Step 6: Final answer
    x = 15,782.53

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1.5x scale

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.