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Finding the Fourth Proportional to 447.42, 671.25 and 139.26

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Solution

The fourth proportional to 447.42, 671.25 and 139.26 is: 208.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.42 : 671.25 = 139.26 : x
  2. Step 2: Convert to fraction form
    447.42/671.25 = 139.26/x
  3. Step 3: Cross multiply
    447.42x = 671.25 × 139.26
  4. Step 4: Simplify right side
    447.42x = 93,478.28
  5. Step 5: Solve for x
    x = 93,478.28/447.42
  6. Step 6: Final answer
    x = 208.93

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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.