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Finding the Fourth Proportional to 447.45, 670.94 and 139.17

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Solution

The fourth proportional to 447.45, 670.94 and 139.17 is: 208.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.45 : 670.94 = 139.17 : x
  2. Step 2: Convert to fraction form
    447.45/670.94 = 139.17/x
  3. Step 3: Cross multiply
    447.45x = 670.94 × 139.17
  4. Step 4: Simplify right side
    447.45x = 93,374.02
  5. Step 5: Solve for x
    x = 93,374.02/447.45
  6. Step 6: Final answer
    x = 208.68

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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.