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Finding the Fourth Proportional to 345.70, 518.55 and 129.22

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Solution

The fourth proportional to 345.70, 518.55 and 129.22 is: 193.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.70 : 518.55 = 129.22 : x
  2. Step 2: Convert to fraction form
    345.70/518.55 = 129.22/x
  3. Step 3: Cross multiply
    345.70x = 518.55 × 129.22
  4. Step 4: Simplify right side
    345.70x = 67,007.03
  5. Step 5: Solve for x
    x = 67,007.03/345.70
  6. Step 6: Final answer
    x = 193.83

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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.