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Finding the Fourth Proportional to 665.42, 996.78 and 340.34

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Solution

The fourth proportional to 665.42, 996.78 and 340.34 is: 509.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.42 : 996.78 = 340.34 : x
  2. Step 2: Convert to fraction form
    665.42/996.78 = 340.34/x
  3. Step 3: Cross multiply
    665.42x = 996.78 × 340.34
  4. Step 4: Simplify right side
    665.42x = 339,244.11
  5. Step 5: Solve for x
    x = 339,244.11/665.42
  6. Step 6: Final answer
    x = 509.82

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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.