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Finding the Fourth Proportional to 320.21, 480.26 and 114.75

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Solution

The fourth proportional to 320.21, 480.26 and 114.75 is: 172.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.21 : 480.26 = 114.75 : x
  2. Step 2: Convert to fraction form
    320.21/480.26 = 114.75/x
  3. Step 3: Cross multiply
    320.21x = 480.26 × 114.75
  4. Step 4: Simplify right side
    320.21x = 55,109.84
  5. Step 5: Solve for x
    x = 55,109.84/320.21
  6. Step 6: Final answer
    x = 172.11

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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.