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Finding the Fourth Proportional to 485.21, 669.44 and 438.43

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Solution

The fourth proportional to 485.21, 669.44 and 438.43 is: 604.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.21 : 669.44 = 438.43 : x
  2. Step 2: Convert to fraction form
    485.21/669.44 = 438.43/x
  3. Step 3: Cross multiply
    485.21x = 669.44 × 438.43
  4. Step 4: Simplify right side
    485.21x = 293,502.02
  5. Step 5: Solve for x
    x = 293,502.02/485.21
  6. Step 6: Final answer
    x = 604.90

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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.