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Finding the Fourth Proportional to 144.02, 216.27 and 137.78

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Solution

The fourth proportional to 144.02, 216.27 and 137.78 is: 206.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.02 : 216.27 = 137.78 : x
  2. Step 2: Convert to fraction form
    144.02/216.27 = 137.78/x
  3. Step 3: Cross multiply
    144.02x = 216.27 × 137.78
  4. Step 4: Simplify right side
    144.02x = 29,797.68
  5. Step 5: Solve for x
    x = 29,797.68/144.02
  6. Step 6: Final answer
    x = 206.90

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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.