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Finding the Fourth Proportional to 665.36, 996.20 and 339.12

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Solution

The fourth proportional to 665.36, 996.20 and 339.12 is: 507.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.36 : 996.20 = 339.12 : x
  2. Step 2: Convert to fraction form
    665.36/996.20 = 339.12/x
  3. Step 3: Cross multiply
    665.36x = 996.20 × 339.12
  4. Step 4: Simplify right side
    665.36x = 337,831.34
  5. Step 5: Solve for x
    x = 337,831.34/665.36
  6. Step 6: Final answer
    x = 507.74

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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.