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Finding the Fourth Proportional to 721.63, 994.78 and 511.17

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Solution

The fourth proportional to 721.63, 994.78 and 511.17 is: 704.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.63 : 994.78 = 511.17 : x
  2. Step 2: Convert to fraction form
    721.63/994.78 = 511.17/x
  3. Step 3: Cross multiply
    721.63x = 994.78 × 511.17
  4. Step 4: Simplify right side
    721.63x = 508,501.69
  5. Step 5: Solve for x
    x = 508,501.69/721.63
  6. Step 6: Final answer
    x = 704.66

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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.