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Finding the Fourth Proportional to 718.88, 991.88 and 408.32

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Solution

The fourth proportional to 718.88, 991.88 and 408.32 is: 563.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.88 : 991.88 = 408.32 : x
  2. Step 2: Convert to fraction form
    718.88/991.88 = 408.32/x
  3. Step 3: Cross multiply
    718.88x = 991.88 × 408.32
  4. Step 4: Simplify right side
    718.88x = 405,004.44
  5. Step 5: Solve for x
    x = 405,004.44/718.88
  6. Step 6: Final answer
    x = 563.38

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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.