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Finding the Fourth Proportional to 1,247.34, 1,721.32 and 687.79

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Solution

The fourth proportional to 1,247.34, 1,721.32 and 687.79 is: 949.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.34 : 1,721.32 = 687.79 : x
  2. Step 2: Convert to fraction form
    1,247.34/1,721.32 = 687.79/x
  3. Step 3: Cross multiply
    1,247.34x = 1,721.32 × 687.79
  4. Step 4: Simplify right side
    1,247.34x = 1,183,906.68
  5. Step 5: Solve for x
    x = 1,183,906.68/1,247.34
  6. Step 6: Final answer
    x = 949.15

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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.