Home / 100,150.21-138,199.12-57,129.49

Finding the Fourth Proportional to 100,150.21, 138,199.12 and 57,129.49

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Solution

The fourth proportional to 100,150.21, 138,199.12 and 57,129.49 is: 78,834.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,150.21 : 138,199.12 = 57,129.49 : x
  2. Step 2: Convert to fraction form
    100,150.21/138,199.12 = 57,129.49/x
  3. Step 3: Cross multiply
    100,150.21x = 138,199.12 × 57,129.49
  4. Step 4: Simplify right side
    100,150.21x = 7,895,245,244.05
  5. Step 5: Solve for x
    x = 7,895,245,244.05/100,150.21
  6. Step 6: Final answer
    x = 78,834.04

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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.