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Finding the Fourth Proportional to 320.51, 480.60 and 115.05

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Solution

The fourth proportional to 320.51, 480.60 and 115.05 is: 172.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.51 : 480.60 = 115.05 : x
  2. Step 2: Convert to fraction form
    320.51/480.60 = 115.05/x
  3. Step 3: Cross multiply
    320.51x = 480.60 × 115.05
  4. Step 4: Simplify right side
    320.51x = 55,293.03
  5. Step 5: Solve for x
    x = 55,293.03/320.51
  6. Step 6: Final answer
    x = 172.51

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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.