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Finding the Fourth Proportional to 320.92, 481.40 and 128.52

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Solution

The fourth proportional to 320.92, 481.40 and 128.52 is: 192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.92 : 481.40 = 128.52 : x
  2. Step 2: Convert to fraction form
    320.92/481.40 = 128.52/x
  3. Step 3: Cross multiply
    320.92x = 481.40 × 128.52
  4. Step 4: Simplify right side
    320.92x = 61,869.53
  5. Step 5: Solve for x
    x = 61,869.53/320.92
  6. Step 6: Final answer
    x = 192.79

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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.