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Finding the Fourth Proportional to 229.89, 345.12 and 138.63

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Solution

The fourth proportional to 229.89, 345.12 and 138.63 is: 208.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.89 : 345.12 = 138.63 : x
  2. Step 2: Convert to fraction form
    229.89/345.12 = 138.63/x
  3. Step 3: Cross multiply
    229.89x = 345.12 × 138.63
  4. Step 4: Simplify right side
    229.89x = 47,843.99
  5. Step 5: Solve for x
    x = 47,843.99/229.89
  6. Step 6: Final answer
    x = 208.12

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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.