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Finding the Fourth Proportional to 348.75, 523.04 and 105.21

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Solution

The fourth proportional to 348.75, 523.04 and 105.21 is: 157.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.75 : 523.04 = 105.21 : x
  2. Step 2: Convert to fraction form
    348.75/523.04 = 105.21/x
  3. Step 3: Cross multiply
    348.75x = 523.04 × 105.21
  4. Step 4: Simplify right side
    348.75x = 55,028.51
  5. Step 5: Solve for x
    x = 55,028.51/348.75
  6. Step 6: Final answer
    x = 157.79

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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.