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Finding the Fourth Proportional to 343.20, 514.62 and 137.64

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Solution

The fourth proportional to 343.20, 514.62 and 137.64 is: 206.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.20 : 514.62 = 137.64 : x
  2. Step 2: Convert to fraction form
    343.20/514.62 = 137.64/x
  3. Step 3: Cross multiply
    343.20x = 514.62 × 137.64
  4. Step 4: Simplify right side
    343.20x = 70,832.30
  5. Step 5: Solve for x
    x = 70,832.30/343.20
  6. Step 6: Final answer
    x = 206.39

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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.