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Finding the Fourth Proportional to 790.96, 1,091.40 and 441.64

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Solution

The fourth proportional to 790.96, 1,091.40 and 441.64 is: 609.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.96 : 1,091.40 = 441.64 : x
  2. Step 2: Convert to fraction form
    790.96/1,091.40 = 441.64/x
  3. Step 3: Cross multiply
    790.96x = 1,091.40 × 441.64
  4. Step 4: Simplify right side
    790.96x = 482,005.90
  5. Step 5: Solve for x
    x = 482,005.90/790.96
  6. Step 6: Final answer
    x = 609.39

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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.