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Finding the Fourth Proportional to 718.96, 992.20 and 408.56

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Solution

The fourth proportional to 718.96, 992.20 and 408.56 is: 563.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.96 : 992.20 = 408.56 : x
  2. Step 2: Convert to fraction form
    718.96/992.20 = 408.56/x
  3. Step 3: Cross multiply
    718.96x = 992.20 × 408.56
  4. Step 4: Simplify right side
    718.96x = 405,373.23
  5. Step 5: Solve for x
    x = 405,373.23/718.96
  6. Step 6: Final answer
    x = 563.83

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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.