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Finding the Fourth Proportional to 144.56, 215.68 and 137.68

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Solution

The fourth proportional to 144.56, 215.68 and 137.68 is: 205.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.56 : 215.68 = 137.68 : x
  2. Step 2: Convert to fraction form
    144.56/215.68 = 137.68/x
  3. Step 3: Cross multiply
    144.56x = 215.68 × 137.68
  4. Step 4: Simplify right side
    144.56x = 29,694.82
  5. Step 5: Solve for x
    x = 29,694.82/144.56
  6. Step 6: Final answer
    x = 205.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.