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Finding the Fourth Proportional to 479.15, 717.79 and 427.55

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Solution

The fourth proportional to 479.15, 717.79 and 427.55 is: 640.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.15 : 717.79 = 427.55 : x
  2. Step 2: Convert to fraction form
    479.15/717.79 = 427.55/x
  3. Step 3: Cross multiply
    479.15x = 717.79 × 427.55
  4. Step 4: Simplify right side
    479.15x = 306,891.11
  5. Step 5: Solve for x
    x = 306,891.11/479.15
  6. Step 6: Final answer
    x = 640.49

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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.