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Finding the Fourth Proportional to 229.90, 344.87 and 138.40

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Solution

The fourth proportional to 229.90, 344.87 and 138.40 is: 207.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.90 : 344.87 = 138.40 : x
  2. Step 2: Convert to fraction form
    229.90/344.87 = 138.40/x
  3. Step 3: Cross multiply
    229.90x = 344.87 × 138.40
  4. Step 4: Simplify right side
    229.90x = 47,729.32
  5. Step 5: Solve for x
    x = 47,729.32/229.90
  6. Step 6: Final answer
    x = 207.61

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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.