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Finding the Fourth Proportional to 665.08, 996.86 and 339.76

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Solution

The fourth proportional to 665.08, 996.86 and 339.76 is: 509.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.08 : 996.86 = 339.76 : x
  2. Step 2: Convert to fraction form
    665.08/996.86 = 339.76/x
  3. Step 3: Cross multiply
    665.08x = 996.86 × 339.76
  4. Step 4: Simplify right side
    665.08x = 338,693.15
  5. Step 5: Solve for x
    x = 338,693.15/665.08
  6. Step 6: Final answer
    x = 509.25

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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.