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Finding the Fourth Proportional to 447.72, 671.55 and 139.53

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Solution

The fourth proportional to 447.72, 671.55 and 139.53 is: 209.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.72 : 671.55 = 139.53 : x
  2. Step 2: Convert to fraction form
    447.72/671.55 = 139.53/x
  3. Step 3: Cross multiply
    447.72x = 671.55 × 139.53
  4. Step 4: Simplify right side
    447.72x = 93,699.69
  5. Step 5: Solve for x
    x = 93,699.69/447.72
  6. Step 6: Final answer
    x = 209.28

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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.