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Finding the Fourth Proportional to 343.53, 515.30 and 138.06

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Solution

The fourth proportional to 343.53, 515.30 and 138.06 is: 207.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.53 : 515.30 = 138.06 : x
  2. Step 2: Convert to fraction form
    343.53/515.30 = 138.06/x
  3. Step 3: Cross multiply
    343.53x = 515.30 × 138.06
  4. Step 4: Simplify right side
    343.53x = 71,141.63
  5. Step 5: Solve for x
    x = 71,141.63/343.53
  6. Step 6: Final answer
    x = 207.09

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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.