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Finding the Fourth Proportional to 321.24, 481.86 and 128.87

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Solution

The fourth proportional to 321.24, 481.86 and 128.87 is: 193.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.24 : 481.86 = 128.87 : x
  2. Step 2: Convert to fraction form
    321.24/481.86 = 128.87/x
  3. Step 3: Cross multiply
    321.24x = 481.86 × 128.87
  4. Step 4: Simplify right side
    321.24x = 62,094.89
  5. Step 5: Solve for x
    x = 62,094.89/321.24
  6. Step 6: Final answer
    x = 193.30

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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.