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Finding the Fourth Proportional to 789.18, 1,181.33 and 616.35

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Solution

The fourth proportional to 789.18, 1,181.33 and 616.35 is: 922.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.18 : 1,181.33 = 616.35 : x
  2. Step 2: Convert to fraction form
    789.18/1,181.33 = 616.35/x
  3. Step 3: Cross multiply
    789.18x = 1,181.33 × 616.35
  4. Step 4: Simplify right side
    789.18x = 728,109.66
  5. Step 5: Solve for x
    x = 728,109.66/789.18
  6. Step 6: Final answer
    x = 922.62

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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.