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Finding the Fourth Proportional to 320.26, 480.39 and 103.81

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Solution

The fourth proportional to 320.26, 480.39 and 103.81 is: 155.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.26 : 480.39 = 103.81 : x
  2. Step 2: Convert to fraction form
    320.26/480.39 = 103.81/x
  3. Step 3: Cross multiply
    320.26x = 480.39 × 103.81
  4. Step 4: Simplify right side
    320.26x = 49,869.29
  5. Step 5: Solve for x
    x = 49,869.29/320.26
  6. Step 6: Final answer
    x = 155.72

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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.