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Finding the Fourth Proportional to 343.28, 514.55 and 137.76

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Solution

The fourth proportional to 343.28, 514.55 and 137.76 is: 206.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.28 : 514.55 = 137.76 : x
  2. Step 2: Convert to fraction form
    343.28/514.55 = 137.76/x
  3. Step 3: Cross multiply
    343.28x = 514.55 × 137.76
  4. Step 4: Simplify right side
    343.28x = 70,883.72
  5. Step 5: Solve for x
    x = 70,883.72/343.28
  6. Step 6: Final answer
    x = 206.49

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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.