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Finding the Fourth Proportional to 78,397.74, 117,399.60 and 60,879.78

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Solution

The fourth proportional to 78,397.74, 117,399.60 and 60,879.78 is: 91,166.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,397.74 : 117,399.60 = 60,879.78 : x
  2. Step 2: Convert to fraction form
    78,397.74/117,399.60 = 60,879.78/x
  3. Step 3: Cross multiply
    78,397.74x = 117,399.60 × 60,879.78
  4. Step 4: Simplify right side
    78,397.74x = 7,147,261,820.09
  5. Step 5: Solve for x
    x = 7,147,261,820.09/78,397.74
  6. Step 6: Final answer
    x = 91,166.68

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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.