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Finding the Fourth Proportional to 318.63, 479.63 and 271.65

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Solution

The fourth proportional to 318.63, 479.63 and 271.65 is: 408.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.63 : 479.63 = 271.65 : x
  2. Step 2: Convert to fraction form
    318.63/479.63 = 271.65/x
  3. Step 3: Cross multiply
    318.63x = 479.63 × 271.65
  4. Step 4: Simplify right side
    318.63x = 130,293.20
  5. Step 5: Solve for x
    x = 130,293.20/318.63
  6. Step 6: Final answer
    x = 408.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.