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Finding the Fourth Proportional to 720.99, 994.86 and 406.23

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Solution

The fourth proportional to 720.99, 994.86 and 406.23 is: 560.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.99 : 994.86 = 406.23 : x
  2. Step 2: Convert to fraction form
    720.99/994.86 = 406.23/x
  3. Step 3: Cross multiply
    720.99x = 994.86 × 406.23
  4. Step 4: Simplify right side
    720.99x = 404,141.98
  5. Step 5: Solve for x
    x = 404,141.98/720.99
  6. Step 6: Final answer
    x = 560.54

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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.