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Finding the Fourth Proportional to 721.04, 994.99 and 406.35

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Solution

The fourth proportional to 721.04, 994.99 and 406.35 is: 560.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.04 : 994.99 = 406.35 : x
  2. Step 2: Convert to fraction form
    721.04/994.99 = 406.35/x
  3. Step 3: Cross multiply
    721.04x = 994.99 × 406.35
  4. Step 4: Simplify right side
    721.04x = 404,314.19
  5. Step 5: Solve for x
    x = 404,314.19/721.04
  6. Step 6: Final answer
    x = 560.74

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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.