Home / 20,118.88-30,173.64-7,640.38

Finding the Fourth Proportional to 20,118.88, 30,173.64 and 7,640.38

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Solution

The fourth proportional to 20,118.88, 30,173.64 and 7,640.38 is: 11,458.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,118.88 : 30,173.64 = 7,640.38 : x
  2. Step 2: Convert to fraction form
    20,118.88/30,173.64 = 7,640.38/x
  3. Step 3: Cross multiply
    20,118.88x = 30,173.64 × 7,640.38
  4. Step 4: Simplify right side
    20,118.88x = 230,538,075.58
  5. Step 5: Solve for x
    x = 230,538,075.58/20,118.88
  6. Step 6: Final answer
    x = 11,458.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.