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Finding the Fourth Proportional to 479.89, 720.42 and 316.09

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Solution

The fourth proportional to 479.89, 720.42 and 316.09 is: 474.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.89 : 720.42 = 316.09 : x
  2. Step 2: Convert to fraction form
    479.89/720.42 = 316.09/x
  3. Step 3: Cross multiply
    479.89x = 720.42 × 316.09
  4. Step 4: Simplify right side
    479.89x = 227,717.56
  5. Step 5: Solve for x
    x = 227,717.56/479.89
  6. Step 6: Final answer
    x = 474.52

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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.