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Finding the Fourth Proportional to 320.70, 481.18 and 125.72

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Solution

The fourth proportional to 320.70, 481.18 and 125.72 is: 188.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.70 : 481.18 = 125.72 : x
  2. Step 2: Convert to fraction form
    320.70/481.18 = 125.72/x
  3. Step 3: Cross multiply
    320.70x = 481.18 × 125.72
  4. Step 4: Simplify right side
    320.70x = 60,493.95
  5. Step 5: Solve for x
    x = 60,493.95/320.70
  6. Step 6: Final answer
    x = 188.63

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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.