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Finding the Fourth Proportional to 729.40, 1,099.68 and 721.24

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Solution

The fourth proportional to 729.40, 1,099.68 and 721.24 is: 1,087.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.40 : 1,099.68 = 721.24 : x
  2. Step 2: Convert to fraction form
    729.40/1,099.68 = 721.24/x
  3. Step 3: Cross multiply
    729.40x = 1,099.68 × 721.24
  4. Step 4: Simplify right side
    729.40x = 793,133.20
  5. Step 5: Solve for x
    x = 793,133.20/729.40
  6. Step 6: Final answer
    x = 1,087.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.