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Finding the Fourth Proportional to 905.23, 1,247.97 and 757.63

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Solution

The fourth proportional to 905.23, 1,247.97 and 757.63 is: 1,044.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.23 : 1,247.97 = 757.63 : x
  2. Step 2: Convert to fraction form
    905.23/1,247.97 = 757.63/x
  3. Step 3: Cross multiply
    905.23x = 1,247.97 × 757.63
  4. Step 4: Simplify right side
    905.23x = 945,499.51
  5. Step 5: Solve for x
    x = 945,499.51/905.23
  6. Step 6: Final answer
    x = 1,044.49

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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.