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Finding the Fourth Proportional to 86,850.21, 130,078.49 and 68,012.85

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Solution

The fourth proportional to 86,850.21, 130,078.49 and 68,012.85 is: 101,865.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,850.21 : 130,078.49 = 68,012.85 : x
  2. Step 2: Convert to fraction form
    86,850.21/130,078.49 = 68,012.85/x
  3. Step 3: Cross multiply
    86,850.21x = 130,078.49 × 68,012.85
  4. Step 4: Simplify right side
    86,850.21x = 8,847,008,828.60
  5. Step 5: Solve for x
    x = 8,847,008,828.60/86,850.21
  6. Step 6: Final answer
    x = 101,865.14

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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.