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Finding the Fourth Proportional to 125,611.70, 188,198.85 and 81,215.60

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Solution

The fourth proportional to 125,611.70, 188,198.85 and 81,215.60 is: 121,682.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,611.70 : 188,198.85 = 81,215.60 : x
  2. Step 2: Convert to fraction form
    125,611.70/188,198.85 = 81,215.60/x
  3. Step 3: Cross multiply
    125,611.70x = 188,198.85 × 81,215.60
  4. Step 4: Simplify right side
    125,611.70x = 15,284,682,522.06
  5. Step 5: Solve for x
    x = 15,284,682,522.06/125,611.70
  6. Step 6: Final answer
    x = 121,682.00

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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.