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Finding the Fourth Proportional to 756.82, 1,126.96 and 729.15

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Solution

The fourth proportional to 756.82, 1,126.96 and 729.15 is: 1,085.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.82 : 1,126.96 = 729.15 : x
  2. Step 2: Convert to fraction form
    756.82/1,126.96 = 729.15/x
  3. Step 3: Cross multiply
    756.82x = 1,126.96 × 729.15
  4. Step 4: Simplify right side
    756.82x = 821,722.88
  5. Step 5: Solve for x
    x = 821,722.88/756.82
  6. Step 6: Final answer
    x = 1,085.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.