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Finding the Fourth Proportional to 721.52, 990.90 and 604.88

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Solution

The fourth proportional to 721.52, 990.90 and 604.88 is: 830.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.52 : 990.90 = 604.88 : x
  2. Step 2: Convert to fraction form
    721.52/990.90 = 604.88/x
  3. Step 3: Cross multiply
    721.52x = 990.90 × 604.88
  4. Step 4: Simplify right side
    721.52x = 599,375.59
  5. Step 5: Solve for x
    x = 599,375.59/721.52
  6. Step 6: Final answer
    x = 830.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.