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Finding the Fourth Proportional to 345.62, 518.49 and 129.21

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Solution

The fourth proportional to 345.62, 518.49 and 129.21 is: 193.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.62 : 518.49 = 129.21 : x
  2. Step 2: Convert to fraction form
    345.62/518.49 = 129.21/x
  3. Step 3: Cross multiply
    345.62x = 518.49 × 129.21
  4. Step 4: Simplify right side
    345.62x = 66,994.09
  5. Step 5: Solve for x
    x = 66,994.09/345.62
  6. Step 6: Final answer
    x = 193.84

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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.