Home / 20,377.89-28,121.16-11,425.38

Finding the Fourth Proportional to 20,377.89, 28,121.16 and 11,425.38

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Solution

The fourth proportional to 20,377.89, 28,121.16 and 11,425.38 is: 15,766.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,377.89 : 28,121.16 = 11,425.38 : x
  2. Step 2: Convert to fraction form
    20,377.89/28,121.16 = 11,425.38/x
  3. Step 3: Cross multiply
    20,377.89x = 28,121.16 × 11,425.38
  4. Step 4: Simplify right side
    20,377.89x = 321,294,939.04
  5. Step 5: Solve for x
    x = 321,294,939.04/20,377.89
  6. Step 6: Final answer
    x = 15,766.84

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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.