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Finding the Fourth Proportional to 345.75, 518.51 and 129.21

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Solution

The fourth proportional to 345.75, 518.51 and 129.21 is: 193.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.75 : 518.51 = 129.21 : x
  2. Step 2: Convert to fraction form
    345.75/518.51 = 129.21/x
  3. Step 3: Cross multiply
    345.75x = 518.51 × 129.21
  4. Step 4: Simplify right side
    345.75x = 66,996.03
  5. Step 5: Solve for x
    x = 66,996.03/345.75
  6. Step 6: Final answer
    x = 193.77

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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.