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Finding the Fourth Proportional to 229.99, 345.21 and 127.39

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Solution

The fourth proportional to 229.99, 345.21 and 127.39 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.99 : 345.21 = 127.39 : x
  2. Step 2: Convert to fraction form
    229.99/345.21 = 127.39/x
  3. Step 3: Cross multiply
    229.99x = 345.21 × 127.39
  4. Step 4: Simplify right side
    229.99x = 43,976.30
  5. Step 5: Solve for x
    x = 43,976.30/229.99
  6. Step 6: Final answer
    x = 191.21

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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.