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Finding the Fourth Proportional to 748.12, 1,122.75 and 518.61

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Solution

The fourth proportional to 748.12, 1,122.75 and 518.61 is: 778.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.12 : 1,122.75 = 518.61 : x
  2. Step 2: Convert to fraction form
    748.12/1,122.75 = 518.61/x
  3. Step 3: Cross multiply
    748.12x = 1,122.75 × 518.61
  4. Step 4: Simplify right side
    748.12x = 582,269.38
  5. Step 5: Solve for x
    x = 582,269.38/748.12
  6. Step 6: Final answer
    x = 778.32

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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.