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Finding the Fourth Proportional to 443.44, 661.73 and 421.57

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Solution

The fourth proportional to 443.44, 661.73 and 421.57 is: 629.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.44 : 661.73 = 421.57 : x
  2. Step 2: Convert to fraction form
    443.44/661.73 = 421.57/x
  3. Step 3: Cross multiply
    443.44x = 661.73 × 421.57
  4. Step 4: Simplify right side
    443.44x = 278,965.52
  5. Step 5: Solve for x
    x = 278,965.52/443.44
  6. Step 6: Final answer
    x = 629.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.