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Finding the Fourth Proportional to 441.20, 661.05 and 286.89

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Solution

The fourth proportional to 441.20, 661.05 and 286.89 is: 429.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.20 : 661.05 = 286.89 : x
  2. Step 2: Convert to fraction form
    441.20/661.05 = 286.89/x
  3. Step 3: Cross multiply
    441.20x = 661.05 × 286.89
  4. Step 4: Simplify right side
    441.20x = 189,648.63
  5. Step 5: Solve for x
    x = 189,648.63/441.20
  6. Step 6: Final answer
    x = 429.85

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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.