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Finding the Fourth Proportional to 308.81, 462.90 and 103.19

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Solution

The fourth proportional to 308.81, 462.90 and 103.19 is: 154.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.81 : 462.90 = 103.19 : x
  2. Step 2: Convert to fraction form
    308.81/462.90 = 103.19/x
  3. Step 3: Cross multiply
    308.81x = 462.90 × 103.19
  4. Step 4: Simplify right side
    308.81x = 47,766.65
  5. Step 5: Solve for x
    x = 47,766.65/308.81
  6. Step 6: Final answer
    x = 154.68

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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.