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Finding the Fourth Proportional to 642.02, 961.94 and 579.78

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Solution

The fourth proportional to 642.02, 961.94 and 579.78 is: 868.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.02 : 961.94 = 579.78 : x
  2. Step 2: Convert to fraction form
    642.02/961.94 = 579.78/x
  3. Step 3: Cross multiply
    642.02x = 961.94 × 579.78
  4. Step 4: Simplify right side
    642.02x = 557,713.57
  5. Step 5: Solve for x
    x = 557,713.57/642.02
  6. Step 6: Final answer
    x = 868.69

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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.