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Finding the Fourth Proportional to 155.49, 214.49 and 122.69

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Solution

The fourth proportional to 155.49, 214.49 and 122.69 is: 169.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.49 : 214.49 = 122.69 : x
  2. Step 2: Convert to fraction form
    155.49/214.49 = 122.69/x
  3. Step 3: Cross multiply
    155.49x = 214.49 × 122.69
  4. Step 4: Simplify right side
    155.49x = 26,314.09
  5. Step 5: Solve for x
    x = 26,314.09/155.49
  6. Step 6: Final answer
    x = 169.23

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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.