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Finding the Fourth Proportional to 144.25, 216.20 and 75.80

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Solution

The fourth proportional to 144.25, 216.20 and 75.80 is: 113.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.25 : 216.20 = 75.80 : x
  2. Step 2: Convert to fraction form
    144.25/216.20 = 75.80/x
  3. Step 3: Cross multiply
    144.25x = 216.20 × 75.80
  4. Step 4: Simplify right side
    144.25x = 16,388.69
  5. Step 5: Solve for x
    x = 16,388.69/144.25
  6. Step 6: Final answer
    x = 113.62

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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.