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Finding the Fourth Proportional to 609.63, 912.29 and 445.29

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Solution

The fourth proportional to 609.63, 912.29 and 445.29 is: 666.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.63 : 912.29 = 445.29 : x
  2. Step 2: Convert to fraction form
    609.63/912.29 = 445.29/x
  3. Step 3: Cross multiply
    609.63x = 912.29 × 445.29
  4. Step 4: Simplify right side
    609.63x = 406,231.39
  5. Step 5: Solve for x
    x = 406,231.39/609.63
  6. Step 6: Final answer
    x = 666.36

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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.