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Finding the Fourth Proportional to 479.49, 661.34 and 311.48

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Solution

The fourth proportional to 479.49, 661.34 and 311.48 is: 429.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.49 : 661.34 = 311.48 : x
  2. Step 2: Convert to fraction form
    479.49/661.34 = 311.48/x
  3. Step 3: Cross multiply
    479.49x = 661.34 × 311.48
  4. Step 4: Simplify right side
    479.49x = 205,996.62
  5. Step 5: Solve for x
    x = 205,996.62/479.49
  6. Step 6: Final answer
    x = 429.62

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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.