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Finding the Fourth Proportional to 729.18, 1,093.61 and 209.04

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Solution

The fourth proportional to 729.18, 1,093.61 and 209.04 is: 313.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.18 : 1,093.61 = 209.04 : x
  2. Step 2: Convert to fraction form
    729.18/1,093.61 = 209.04/x
  3. Step 3: Cross multiply
    729.18x = 1,093.61 × 209.04
  4. Step 4: Simplify right side
    729.18x = 228,608.23
  5. Step 5: Solve for x
    x = 228,608.23/729.18
  6. Step 6: Final answer
    x = 313.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.