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Finding the Fourth Proportional to 721.23, 996.26 and 642.86

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Solution

The fourth proportional to 721.23, 996.26 and 642.86 is: 888.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.23 : 996.26 = 642.86 : x
  2. Step 2: Convert to fraction form
    721.23/996.26 = 642.86/x
  3. Step 3: Cross multiply
    721.23x = 996.26 × 642.86
  4. Step 4: Simplify right side
    721.23x = 640,455.70
  5. Step 5: Solve for x
    x = 640,455.70/721.23
  6. Step 6: Final answer
    x = 888.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.