Home / 100,137.21-138,189.33-55,425.21

Finding the Fourth Proportional to 100,137.21, 138,189.33 and 55,425.21

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Solution

The fourth proportional to 100,137.21, 138,189.33 and 55,425.21 is: 76,486.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,137.21 : 138,189.33 = 55,425.21 : x
  2. Step 2: Convert to fraction form
    100,137.21/138,189.33 = 55,425.21/x
  3. Step 3: Cross multiply
    100,137.21x = 138,189.33 × 55,425.21
  4. Step 4: Simplify right side
    100,137.21x = 7,659,172,635.01
  5. Step 5: Solve for x
    x = 7,659,172,635.01/100,137.21
  6. Step 6: Final answer
    x = 76,486.78

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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.