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Finding the Fourth Proportional to 447.45, 671.28 and 139.30

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Solution

The fourth proportional to 447.45, 671.28 and 139.30 is: 208.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.45 : 671.28 = 139.30 : x
  2. Step 2: Convert to fraction form
    447.45/671.28 = 139.30/x
  3. Step 3: Cross multiply
    447.45x = 671.28 × 139.30
  4. Step 4: Simplify right side
    447.45x = 93,507.63
  5. Step 5: Solve for x
    x = 93,507.63/447.45
  6. Step 6: Final answer
    x = 208.98

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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.