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Finding the Fourth Proportional to 447.40, 670.91 and 139.17

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Solution

The fourth proportional to 447.40, 670.91 and 139.17 is: 208.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.40 : 670.91 = 139.17 : x
  2. Step 2: Convert to fraction form
    447.40/670.91 = 139.17/x
  3. Step 3: Cross multiply
    447.40x = 670.91 × 139.17
  4. Step 4: Simplify right side
    447.40x = 93,370.54
  5. Step 5: Solve for x
    x = 93,370.54/447.40
  6. Step 6: Final answer
    x = 208.70

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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.