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Finding the Fourth Proportional to 155.44, 214.41 and 122.68

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Solution

The fourth proportional to 155.44, 214.41 and 122.68 is: 169.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.44 : 214.41 = 122.68 : x
  2. Step 2: Convert to fraction form
    155.44/214.41 = 122.68/x
  3. Step 3: Cross multiply
    155.44x = 214.41 × 122.68
  4. Step 4: Simplify right side
    155.44x = 26,303.82
  5. Step 5: Solve for x
    x = 26,303.82/155.44
  6. Step 6: Final answer
    x = 169.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.