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Finding the Fourth Proportional to 961.69, 1,441.36 and 412.72

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Solution

The fourth proportional to 961.69, 1,441.36 and 412.72 is: 618.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.69 : 1,441.36 = 412.72 : x
  2. Step 2: Convert to fraction form
    961.69/1,441.36 = 412.72/x
  3. Step 3: Cross multiply
    961.69x = 1,441.36 × 412.72
  4. Step 4: Simplify right side
    961.69x = 594,878.10
  5. Step 5: Solve for x
    x = 594,878.10/961.69
  6. Step 6: Final answer
    x = 618.58

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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.