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Finding the Fourth Proportional to 806.45, 1,208.76 and 343.99

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Solution

The fourth proportional to 806.45, 1,208.76 and 343.99 is: 515.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.45 : 1,208.76 = 343.99 : x
  2. Step 2: Convert to fraction form
    806.45/1,208.76 = 343.99/x
  3. Step 3: Cross multiply
    806.45x = 1,208.76 × 343.99
  4. Step 4: Simplify right side
    806.45x = 415,798.33
  5. Step 5: Solve for x
    x = 415,798.33/806.45
  6. Step 6: Final answer
    x = 515.59

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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.