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Finding the Fourth Proportional to 961.21, 1,441.82 and 384.09

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Solution

The fourth proportional to 961.21, 1,441.82 and 384.09 is: 576.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.21 : 1,441.82 = 384.09 : x
  2. Step 2: Convert to fraction form
    961.21/1,441.82 = 384.09/x
  3. Step 3: Cross multiply
    961.21x = 1,441.82 × 384.09
  4. Step 4: Simplify right side
    961.21x = 553,788.64
  5. Step 5: Solve for x
    x = 553,788.64/961.21
  6. Step 6: Final answer
    x = 576.14

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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.