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Finding the Fourth Proportional to 720.85, 994.76 and 406.17

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Solution

The fourth proportional to 720.85, 994.76 and 406.17 is: 560.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.85 : 994.76 = 406.17 : x
  2. Step 2: Convert to fraction form
    720.85/994.76 = 406.17/x
  3. Step 3: Cross multiply
    720.85x = 994.76 × 406.17
  4. Step 4: Simplify right side
    720.85x = 404,046.24
  5. Step 5: Solve for x
    x = 404,046.24/720.85
  6. Step 6: Final answer
    x = 560.51

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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.