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Finding the Fourth Proportional to 155.53, 214.91 and 122.43

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Solution

The fourth proportional to 155.53, 214.91 and 122.43 is: 169.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.53 : 214.91 = 122.43 : x
  2. Step 2: Convert to fraction form
    155.53/214.91 = 122.43/x
  3. Step 3: Cross multiply
    155.53x = 214.91 × 122.43
  4. Step 4: Simplify right side
    155.53x = 26,311.43
  5. Step 5: Solve for x
    x = 26,311.43/155.53
  6. Step 6: Final answer
    x = 169.17

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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.