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Finding the Fourth Proportional to 78,745.70, 118,142.40 and 28,138.10

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Solution

The fourth proportional to 78,745.70, 118,142.40 and 28,138.10 is: 42,215.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,745.70 : 118,142.40 = 28,138.10 : x
  2. Step 2: Convert to fraction form
    78,745.70/118,142.40 = 28,138.10/x
  3. Step 3: Cross multiply
    78,745.70x = 118,142.40 × 28,138.10
  4. Step 4: Simplify right side
    78,745.70x = 3,324,302,074.73
  5. Step 5: Solve for x
    x = 3,324,302,074.73/78,745.70
  6. Step 6: Final answer
    x = 42,215.67

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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.