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Finding the Fourth Proportional to 729.10, 1,091.80 and 404.11

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Solution

The fourth proportional to 729.10, 1,091.80 and 404.11 is: 605.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.10 : 1,091.80 = 404.11 : x
  2. Step 2: Convert to fraction form
    729.10/1,091.80 = 404.11/x
  3. Step 3: Cross multiply
    729.10x = 1,091.80 × 404.11
  4. Step 4: Simplify right side
    729.10x = 441,207.30
  5. Step 5: Solve for x
    x = 441,207.30/729.10
  6. Step 6: Final answer
    x = 605.14

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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.