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Finding the Fourth Proportional to 447.84, 671.78 and 139.68

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Solution

The fourth proportional to 447.84, 671.78 and 139.68 is: 209.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.84 : 671.78 = 139.68 : x
  2. Step 2: Convert to fraction form
    447.84/671.78 = 139.68/x
  3. Step 3: Cross multiply
    447.84x = 671.78 × 139.68
  4. Step 4: Simplify right side
    447.84x = 93,834.23
  5. Step 5: Solve for x
    x = 93,834.23/447.84
  6. Step 6: Final answer
    x = 209.53

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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.