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Finding the Fourth Proportional to 748.76, 1,120.82 and 684.97

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Solution

The fourth proportional to 748.76, 1,120.82 and 684.97 is: 1,025.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.76 : 1,120.82 = 684.97 : x
  2. Step 2: Convert to fraction form
    748.76/1,120.82 = 684.97/x
  3. Step 3: Cross multiply
    748.76x = 1,120.82 × 684.97
  4. Step 4: Simplify right side
    748.76x = 767,719.05
  5. Step 5: Solve for x
    x = 767,719.05/748.76
  6. Step 6: Final answer
    x = 1,025.32

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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.