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Finding the Fourth Proportional to 78,984.80, 118,246.80 and 76,680.80

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Solution

The fourth proportional to 78,984.80, 118,246.80 and 76,680.80 is: 114,797.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,984.80 : 118,246.80 = 76,680.80 : x
  2. Step 2: Convert to fraction form
    78,984.80/118,246.80 = 76,680.80/x
  3. Step 3: Cross multiply
    78,984.80x = 118,246.80 × 76,680.80
  4. Step 4: Simplify right side
    78,984.80x = 9,067,259,221.44
  5. Step 5: Solve for x
    x = 9,067,259,221.44/78,984.80
  6. Step 6: Final answer
    x = 114,797.52

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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.