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Finding the Fourth Proportional to 188,396.70, 259,979.67 and 103,515.90

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Solution

The fourth proportional to 188,396.70, 259,979.67 and 103,515.90 is: 142,847.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    188,396.70 : 259,979.67 = 103,515.90 : x
  2. Step 2: Convert to fraction form
    188,396.70/259,979.67 = 103,515.90/x
  3. Step 3: Cross multiply
    188,396.70x = 259,979.67 × 103,515.90
  4. Step 4: Simplify right side
    188,396.70x = 26,912,029,521.75
  5. Step 5: Solve for x
    x = 26,912,029,521.75/188,396.70
  6. Step 6: Final answer
    x = 142,847.67

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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.