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Finding the Fourth Proportional to 720.82, 994.71 and 406.09

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Solution

The fourth proportional to 720.82, 994.71 and 406.09 is: 560.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.82 : 994.71 = 406.09 : x
  2. Step 2: Convert to fraction form
    720.82/994.71 = 406.09/x
  3. Step 3: Cross multiply
    720.82x = 994.71 × 406.09
  4. Step 4: Simplify right side
    720.82x = 403,941.78
  5. Step 5: Solve for x
    x = 403,941.78/720.82
  6. Step 6: Final answer
    x = 560.39

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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.