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Finding the Fourth Proportional to 479.46, 661.82 and 311.64

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Solution

The fourth proportional to 479.46, 661.82 and 311.64 is: 430.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.46 : 661.82 = 311.64 : x
  2. Step 2: Convert to fraction form
    479.46/661.82 = 311.64/x
  3. Step 3: Cross multiply
    479.46x = 661.82 × 311.64
  4. Step 4: Simplify right side
    479.46x = 206,248.03
  5. Step 5: Solve for x
    x = 206,248.03/479.46
  6. Step 6: Final answer
    x = 430.17

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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.