Home / 20,388.78-28,137.80-11,436.84

Finding the Fourth Proportional to 20,388.78, 28,137.80 and 11,436.84

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Solution

The fourth proportional to 20,388.78, 28,137.80 and 11,436.84 is: 15,783.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.78 : 28,137.80 = 11,436.84 : x
  2. Step 2: Convert to fraction form
    20,388.78/28,137.80 = 11,436.84/x
  3. Step 3: Cross multiply
    20,388.78x = 28,137.80 × 11,436.84
  4. Step 4: Simplify right side
    20,388.78x = 321,807,545.14
  5. Step 5: Solve for x
    x = 321,807,545.14/20,388.78
  6. Step 6: Final answer
    x = 15,783.56

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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.