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Finding the Fourth Proportional to 318.87, 479.79 and 264.42

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Solution

The fourth proportional to 318.87, 479.79 and 264.42 is: 397.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.87 : 479.79 = 264.42 : x
  2. Step 2: Convert to fraction form
    318.87/479.79 = 264.42/x
  3. Step 3: Cross multiply
    318.87x = 479.79 × 264.42
  4. Step 4: Simplify right side
    318.87x = 126,866.07
  5. Step 5: Solve for x
    x = 126,866.07/318.87
  6. Step 6: Final answer
    x = 397.86

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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.