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Finding the Fourth Proportional to 447.39, 670.91 and 139.14

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Solution

The fourth proportional to 447.39, 670.91 and 139.14 is: 208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.39 : 670.91 = 139.14 : x
  2. Step 2: Convert to fraction form
    447.39/670.91 = 139.14/x
  3. Step 3: Cross multiply
    447.39x = 670.91 × 139.14
  4. Step 4: Simplify right side
    447.39x = 93,349.72
  5. Step 5: Solve for x
    x = 93,349.72/447.39
  6. Step 6: Final answer
    x = 208.65

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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.