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Finding the Fourth Proportional to 343.54, 515.52 and 138.09

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Solution

The fourth proportional to 343.54, 515.52 and 138.09 is: 207.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.54 : 515.52 = 138.09 : x
  2. Step 2: Convert to fraction form
    343.54/515.52 = 138.09/x
  3. Step 3: Cross multiply
    343.54x = 515.52 × 138.09
  4. Step 4: Simplify right side
    343.54x = 71,188.16
  5. Step 5: Solve for x
    x = 71,188.16/343.54
  6. Step 6: Final answer
    x = 207.22

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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.