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Finding the Fourth Proportional to 343.68, 515.20 and 137.92

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Solution

The fourth proportional to 343.68, 515.20 and 137.92 is: 206.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.68 : 515.20 = 137.92 : x
  2. Step 2: Convert to fraction form
    343.68/515.20 = 137.92/x
  3. Step 3: Cross multiply
    343.68x = 515.20 × 137.92
  4. Step 4: Simplify right side
    343.68x = 71,056.38
  5. Step 5: Solve for x
    x = 71,056.38/343.68
  6. Step 6: Final answer
    x = 206.75

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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.