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Finding the Fourth Proportional to 320.71, 480.78 and 272.27

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Solution

The fourth proportional to 320.71, 480.78 and 272.27 is: 408.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.71 : 480.78 = 272.27 : x
  2. Step 2: Convert to fraction form
    320.71/480.78 = 272.27/x
  3. Step 3: Cross multiply
    320.71x = 480.78 × 272.27
  4. Step 4: Simplify right side
    320.71x = 130,901.97
  5. Step 5: Solve for x
    x = 130,901.97/320.71
  6. Step 6: Final answer
    x = 408.16

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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.