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Finding the Fourth Proportional to 321.54, 482.20 and 105.06

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Solution

The fourth proportional to 321.54, 482.20 and 105.06 is: 157.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.54 : 482.20 = 105.06 : x
  2. Step 2: Convert to fraction form
    321.54/482.20 = 105.06/x
  3. Step 3: Cross multiply
    321.54x = 482.20 × 105.06
  4. Step 4: Simplify right side
    321.54x = 50,659.93
  5. Step 5: Solve for x
    x = 50,659.93/321.54
  6. Step 6: Final answer
    x = 157.55

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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.