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Finding the Fourth Proportional to 229.12, 343.60 and 138.40

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Solution

The fourth proportional to 229.12, 343.60 and 138.40 is: 207.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.12 : 343.60 = 138.40 : x
  2. Step 2: Convert to fraction form
    229.12/343.60 = 138.40/x
  3. Step 3: Cross multiply
    229.12x = 343.60 × 138.40
  4. Step 4: Simplify right side
    229.12x = 47,554.24
  5. Step 5: Solve for x
    x = 47,554.24/229.12
  6. Step 6: Final answer
    x = 207.55

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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.