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Finding the Fourth Proportional to 645.21, 888.87 and 448.38

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Solution

The fourth proportional to 645.21, 888.87 and 448.38 is: 617.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.21 : 888.87 = 448.38 : x
  2. Step 2: Convert to fraction form
    645.21/888.87 = 448.38/x
  3. Step 3: Cross multiply
    645.21x = 888.87 × 448.38
  4. Step 4: Simplify right side
    645.21x = 398,551.53
  5. Step 5: Solve for x
    x = 398,551.53/645.21
  6. Step 6: Final answer
    x = 617.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.