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Finding the Fourth Proportional to 790.80, 1,091.28 and 441.48

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Solution

The fourth proportional to 790.80, 1,091.28 and 441.48 is: 609.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.80 : 1,091.28 = 441.48 : x
  2. Step 2: Convert to fraction form
    790.80/1,091.28 = 441.48/x
  3. Step 3: Cross multiply
    790.80x = 1,091.28 × 441.48
  4. Step 4: Simplify right side
    790.80x = 481,778.29
  5. Step 5: Solve for x
    x = 481,778.29/790.80
  6. Step 6: Final answer
    x = 609.23

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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.