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Finding the Fourth Proportional to 104.25, 156.09 and 76.80

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Solution

The fourth proportional to 104.25, 156.09 and 76.80 is: 114.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.25 : 156.09 = 76.80 : x
  2. Step 2: Convert to fraction form
    104.25/156.09 = 76.80/x
  3. Step 3: Cross multiply
    104.25x = 156.09 × 76.80
  4. Step 4: Simplify right side
    104.25x = 11,987.71
  5. Step 5: Solve for x
    x = 11,987.71/104.25
  6. Step 6: Final answer
    x = 114.99

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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.