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Finding the Fourth Proportional to 339.15, 509.38 and 320.76

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Solution

The fourth proportional to 339.15, 509.38 and 320.76 is: 481.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.15 : 509.38 = 320.76 : x
  2. Step 2: Convert to fraction form
    339.15/509.38 = 320.76/x
  3. Step 3: Cross multiply
    339.15x = 509.38 × 320.76
  4. Step 4: Simplify right side
    339.15x = 163,388.73
  5. Step 5: Solve for x
    x = 163,388.73/339.15
  6. Step 6: Final answer
    x = 481.76

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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.