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Finding the Fourth Proportional to 479.90, 719.69 and 205.81

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Solution

The fourth proportional to 479.90, 719.69 and 205.81 is: 308.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.90 : 719.69 = 205.81 : x
  2. Step 2: Convert to fraction form
    479.90/719.69 = 205.81/x
  3. Step 3: Cross multiply
    479.90x = 719.69 × 205.81
  4. Step 4: Simplify right side
    479.90x = 148,120.04
  5. Step 5: Solve for x
    x = 148,120.04/479.90
  6. Step 6: Final answer
    x = 308.65

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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.