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Finding the Fourth Proportional to 718.92, 992.12 and 408.42

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Solution

The fourth proportional to 718.92, 992.12 and 408.42 is: 563.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.92 : 992.12 = 408.42 : x
  2. Step 2: Convert to fraction form
    718.92/992.12 = 408.42/x
  3. Step 3: Cross multiply
    718.92x = 992.12 × 408.42
  4. Step 4: Simplify right side
    718.92x = 405,199.61
  5. Step 5: Solve for x
    x = 405,199.61/718.92
  6. Step 6: Final answer
    x = 563.62

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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.