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Finding the Fourth Proportional to 619.77, 856.16 and 481.67

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Solution

The fourth proportional to 619.77, 856.16 and 481.67 is: 665.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.77 : 856.16 = 481.67 : x
  2. Step 2: Convert to fraction form
    619.77/856.16 = 481.67/x
  3. Step 3: Cross multiply
    619.77x = 856.16 × 481.67
  4. Step 4: Simplify right side
    619.77x = 412,379.90
  5. Step 5: Solve for x
    x = 412,379.90/619.77
  6. Step 6: Final answer
    x = 665.38

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1.5x scale

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.