Home / 78,438.20-117,584.40-54,745.70

Finding the Fourth Proportional to 78,438.20, 117,584.40 and 54,745.70

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Solution

The fourth proportional to 78,438.20, 117,584.40 and 54,745.70 is: 82,067.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,438.20 : 117,584.40 = 54,745.70 : x
  2. Step 2: Convert to fraction form
    78,438.20/117,584.40 = 54,745.70/x
  3. Step 3: Cross multiply
    78,438.20x = 117,584.40 × 54,745.70
  4. Step 4: Simplify right side
    78,438.20x = 6,437,240,287.08
  5. Step 5: Solve for x
    x = 6,437,240,287.08/78,438.20
  6. Step 6: Final answer
    x = 82,067.67

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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.