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Finding the Fourth Proportional to 729.84, 1,086.96 and 721.20

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Solution

The fourth proportional to 729.84, 1,086.96 and 721.20 is: 1,074.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.84 : 1,086.96 = 721.20 : x
  2. Step 2: Convert to fraction form
    729.84/1,086.96 = 721.20/x
  3. Step 3: Cross multiply
    729.84x = 1,086.96 × 721.20
  4. Step 4: Simplify right side
    729.84x = 783,915.55
  5. Step 5: Solve for x
    x = 783,915.55/729.84
  6. Step 6: Final answer
    x = 1,074.09

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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.