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Finding the Fourth Proportional to 721.56, 994.70 and 511.09

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Solution

The fourth proportional to 721.56, 994.70 and 511.09 is: 704.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.56 : 994.70 = 511.09 : x
  2. Step 2: Convert to fraction form
    721.56/994.70 = 511.09/x
  3. Step 3: Cross multiply
    721.56x = 994.70 × 511.09
  4. Step 4: Simplify right side
    721.56x = 508,373.69
  5. Step 5: Solve for x
    x = 508,373.69/721.56
  6. Step 6: Final answer
    x = 704.55

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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.