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Finding the Fourth Proportional to 78,480.98, 117,795.46 and 28,609.28

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Solution

The fourth proportional to 78,480.98, 117,795.46 and 28,609.28 is: 42,940.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,480.98 : 117,795.46 = 28,609.28 : x
  2. Step 2: Convert to fraction form
    78,480.98/117,795.46 = 28,609.28/x
  3. Step 3: Cross multiply
    78,480.98x = 117,795.46 × 28,609.28
  4. Step 4: Simplify right side
    78,480.98x = 3,370,043,297.87
  5. Step 5: Solve for x
    x = 3,370,043,297.87/78,480.98
  6. Step 6: Final answer
    x = 42,940.89

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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.