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Finding the Fourth Proportional to 479.54, 661.31 and 311.27

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Solution

The fourth proportional to 479.54, 661.31 and 311.27 is: 429.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.54 : 661.31 = 311.27 : x
  2. Step 2: Convert to fraction form
    479.54/661.31 = 311.27/x
  3. Step 3: Cross multiply
    479.54x = 661.31 × 311.27
  4. Step 4: Simplify right side
    479.54x = 205,846.06
  5. Step 5: Solve for x
    x = 205,846.06/479.54
  6. Step 6: Final answer
    x = 429.26

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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.