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Finding the Fourth Proportional to 78,608.40, 117,912.60 and 47,115.60

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Solution

The fourth proportional to 78,608.40, 117,912.60 and 47,115.60 is: 70,673.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,608.40 : 117,912.60 = 47,115.60 : x
  2. Step 2: Convert to fraction form
    78,608.40/117,912.60 = 47,115.60/x
  3. Step 3: Cross multiply
    78,608.40x = 117,912.60 × 47,115.60
  4. Step 4: Simplify right side
    78,608.40x = 5,555,522,896.56
  5. Step 5: Solve for x
    x = 5,555,522,896.56/78,608.40
  6. Step 6: Final answer
    x = 70,673.40

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1.5x scale

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.