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Finding the Fourth Proportional to 78,895.80, 118,416.60 and 39,481.20

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Solution

The fourth proportional to 78,895.80, 118,416.60 and 39,481.20 is: 59,258.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,895.80 : 118,416.60 = 39,481.20 : x
  2. Step 2: Convert to fraction form
    78,895.80/118,416.60 = 39,481.20/x
  3. Step 3: Cross multiply
    78,895.80x = 118,416.60 × 39,481.20
  4. Step 4: Simplify right side
    78,895.80x = 4,675,229,467.92
  5. Step 5: Solve for x
    x = 4,675,229,467.92/78,895.80
  6. Step 6: Final answer
    x = 59,258.28

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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.