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Finding the Fourth Proportional to 479.74, 719.86 and 205.80

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Solution

The fourth proportional to 479.74, 719.86 and 205.80 is: 308.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.74 : 719.86 = 205.80 : x
  2. Step 2: Convert to fraction form
    479.74/719.86 = 205.80/x
  3. Step 3: Cross multiply
    479.74x = 719.86 × 205.80
  4. Step 4: Simplify right side
    479.74x = 148,149.50
  5. Step 5: Solve for x
    x = 148,149.50/479.74
  6. Step 6: Final answer
    x = 308.81

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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.