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Finding the Fourth Proportional to 447.63, 671.43 and 139.48

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Solution

The fourth proportional to 447.63, 671.43 and 139.48 is: 209.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.63 : 671.43 = 139.48 : x
  2. Step 2: Convert to fraction form
    447.63/671.43 = 139.48/x
  3. Step 3: Cross multiply
    447.63x = 671.43 × 139.48
  4. Step 4: Simplify right side
    447.63x = 93,652.42
  5. Step 5: Solve for x
    x = 93,652.42/447.63
  6. Step 6: Final answer
    x = 209.22

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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.