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Finding the Fourth Proportional to 621.12, 856.67 and 481.67

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Solution

The fourth proportional to 621.12, 856.67 and 481.67 is: 664.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.12 : 856.67 = 481.67 : x
  2. Step 2: Convert to fraction form
    621.12/856.67 = 481.67/x
  3. Step 3: Cross multiply
    621.12x = 856.67 × 481.67
  4. Step 4: Simplify right side
    621.12x = 412,625.55
  5. Step 5: Solve for x
    x = 412,625.55/621.12
  6. Step 6: Final answer
    x = 664.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.