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Finding the Fourth Proportional to 990.61, 1,367.37 and 617.38

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Solution

The fourth proportional to 990.61, 1,367.37 and 617.38 is: 852.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.61 : 1,367.37 = 617.38 : x
  2. Step 2: Convert to fraction form
    990.61/1,367.37 = 617.38/x
  3. Step 3: Cross multiply
    990.61x = 1,367.37 × 617.38
  4. Step 4: Simplify right side
    990.61x = 844,183.47
  5. Step 5: Solve for x
    x = 844,183.47/990.61
  6. Step 6: Final answer
    x = 852.19

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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.