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Finding the Fourth Proportional to 642.08, 961.44 and 353.12

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Solution

The fourth proportional to 642.08, 961.44 and 353.12 is: 528.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.08 : 961.44 = 353.12 : x
  2. Step 2: Convert to fraction form
    642.08/961.44 = 353.12/x
  3. Step 3: Cross multiply
    642.08x = 961.44 × 353.12
  4. Step 4: Simplify right side
    642.08x = 339,503.69
  5. Step 5: Solve for x
    x = 339,503.69/642.08
  6. Step 6: Final answer
    x = 528.76

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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.