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Finding the Fourth Proportional to 447.37, 670.98 and 139.21

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Solution

The fourth proportional to 447.37, 670.98 and 139.21 is: 208.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.37 : 670.98 = 139.21 : x
  2. Step 2: Convert to fraction form
    447.37/670.98 = 139.21/x
  3. Step 3: Cross multiply
    447.37x = 670.98 × 139.21
  4. Step 4: Simplify right side
    447.37x = 93,407.13
  5. Step 5: Solve for x
    x = 93,407.13/447.37
  6. Step 6: Final answer
    x = 208.79

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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.