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Finding the Fourth Proportional to 144.36, 216.80 and 138.56

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Solution

The fourth proportional to 144.36, 216.80 and 138.56 is: 208.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.36 : 216.80 = 138.56 : x
  2. Step 2: Convert to fraction form
    144.36/216.80 = 138.56/x
  3. Step 3: Cross multiply
    144.36x = 216.80 × 138.56
  4. Step 4: Simplify right side
    144.36x = 30,039.81
  5. Step 5: Solve for x
    x = 30,039.81/144.36
  6. Step 6: Final answer
    x = 208.09

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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.