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Finding the Fourth Proportional to 729.21, 1,089.49 and 722.73

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Solution

The fourth proportional to 729.21, 1,089.49 and 722.73 is: 1,079.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.21 : 1,089.49 = 722.73 : x
  2. Step 2: Convert to fraction form
    729.21/1,089.49 = 722.73/x
  3. Step 3: Cross multiply
    729.21x = 1,089.49 × 722.73
  4. Step 4: Simplify right side
    729.21x = 787,405.30
  5. Step 5: Solve for x
    x = 787,405.30/729.21
  6. Step 6: Final answer
    x = 1,079.81

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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.