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Finding the Fourth Proportional to 901.05, 1,351.64 and 439.21

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Solution

The fourth proportional to 901.05, 1,351.64 and 439.21 is: 658.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.05 : 1,351.64 = 439.21 : x
  2. Step 2: Convert to fraction form
    901.05/1,351.64 = 439.21/x
  3. Step 3: Cross multiply
    901.05x = 1,351.64 × 439.21
  4. Step 4: Simplify right side
    901.05x = 593,653.80
  5. Step 5: Solve for x
    x = 593,653.80/901.05
  6. Step 6: Final answer
    x = 658.85

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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.