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Finding the Fourth Proportional to 320.83, 481.31 and 128.47

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Solution

The fourth proportional to 320.83, 481.31 and 128.47 is: 192.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.83 : 481.31 = 128.47 : x
  2. Step 2: Convert to fraction form
    320.83/481.31 = 128.47/x
  3. Step 3: Cross multiply
    320.83x = 481.31 × 128.47
  4. Step 4: Simplify right side
    320.83x = 61,833.25
  5. Step 5: Solve for x
    x = 61,833.25/320.83
  6. Step 6: Final answer
    x = 192.73

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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.