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Finding the Fourth Proportional to 609.93, 912.74 and 447.21

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Solution

The fourth proportional to 609.93, 912.74 and 447.21 is: 669.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.93 : 912.74 = 447.21 : x
  2. Step 2: Convert to fraction form
    609.93/912.74 = 447.21/x
  3. Step 3: Cross multiply
    609.93x = 912.74 × 447.21
  4. Step 4: Simplify right side
    609.93x = 408,184.22
  5. Step 5: Solve for x
    x = 408,184.22/609.93
  6. Step 6: Final answer
    x = 669.23

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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.