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Finding the Fourth Proportional to 890.66, 1,229.55 and 611

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Solution

The fourth proportional to 890.66, 1,229.55 and 611 is: 843.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.66 : 1,229.55 = 611 : x
  2. Step 2: Convert to fraction form
    890.66/1,229.55 = 611/x
  3. Step 3: Cross multiply
    890.66x = 1,229.55 × 611
  4. Step 4: Simplify right side
    890.66x = 751,255.05
  5. Step 5: Solve for x
    x = 751,255.05/890.66
  6. Step 6: Final answer
    x = 843.49

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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.