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Finding the Fourth Proportional to 479.30, 661.42 and 269.49

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Solution

The fourth proportional to 479.30, 661.42 and 269.49 is: 371.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.30 : 661.42 = 269.49 : x
  2. Step 2: Convert to fraction form
    479.30/661.42 = 269.49/x
  3. Step 3: Cross multiply
    479.30x = 661.42 × 269.49
  4. Step 4: Simplify right side
    479.30x = 178,244.73
  5. Step 5: Solve for x
    x = 178,244.73/479.30
  6. Step 6: Final answer
    x = 371.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.