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Finding the Fourth Proportional to 721.56, 996.00 and 555.56

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Solution

The fourth proportional to 721.56, 996.00 and 555.56 is: 766.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.56 : 996.00 = 555.56 : x
  2. Step 2: Convert to fraction form
    721.56/996.00 = 555.56/x
  3. Step 3: Cross multiply
    721.56x = 996.00 × 555.56
  4. Step 4: Simplify right side
    721.56x = 553,334.43
  5. Step 5: Solve for x
    x = 553,334.43/721.56
  6. Step 6: Final answer
    x = 766.86

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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.