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Finding the Fourth Proportional to 718.27, 991.15 and 399.25

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Solution

The fourth proportional to 718.27, 991.15 and 399.25 is: 550.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.27 : 991.15 = 399.25 : x
  2. Step 2: Convert to fraction form
    718.27/991.15 = 399.25/x
  3. Step 3: Cross multiply
    718.27x = 991.15 × 399.25
  4. Step 4: Simplify right side
    718.27x = 395,716.64
  5. Step 5: Solve for x
    x = 395,716.64/718.27
  6. Step 6: Final answer
    x = 550.93

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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.