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Finding the Fourth Proportional to 990.26, 1,366.72 and 617.30

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Solution

The fourth proportional to 990.26, 1,366.72 and 617.30 is: 851.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.26 : 1,366.72 = 617.30 : x
  2. Step 2: Convert to fraction form
    990.26/1,366.72 = 617.30/x
  3. Step 3: Cross multiply
    990.26x = 1,366.72 × 617.30
  4. Step 4: Simplify right side
    990.26x = 843,676.26
  5. Step 5: Solve for x
    x = 843,676.26/990.26
  6. Step 6: Final answer
    x = 851.97

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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.