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Finding the Fourth Proportional to 790.72, 1,091.20 and 441.41

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Solution

The fourth proportional to 790.72, 1,091.20 and 441.41 is: 609.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.72 : 1,091.20 = 441.41 : x
  2. Step 2: Convert to fraction form
    790.72/1,091.20 = 441.41/x
  3. Step 3: Cross multiply
    790.72x = 1,091.20 × 441.41
  4. Step 4: Simplify right side
    790.72x = 481,658.93
  5. Step 5: Solve for x
    x = 481,658.93/790.72
  6. Step 6: Final answer
    x = 609.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.