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Finding the Fourth Proportional to 748.43, 1,121.75 and 660.95

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Solution

The fourth proportional to 748.43, 1,121.75 and 660.95 is: 990.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.43 : 1,121.75 = 660.95 : x
  2. Step 2: Convert to fraction form
    748.43/1,121.75 = 660.95/x
  3. Step 3: Cross multiply
    748.43x = 1,121.75 × 660.95
  4. Step 4: Simplify right side
    748.43x = 741,417.36
  5. Step 5: Solve for x
    x = 741,417.36/748.43
  6. Step 6: Final answer
    x = 990.63

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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.