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Finding the Fourth Proportional to 718.91, 992.09 and 404.19

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Solution

The fourth proportional to 718.91, 992.09 and 404.19 is: 557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.91 : 992.09 = 404.19 : x
  2. Step 2: Convert to fraction form
    718.91/992.09 = 404.19/x
  3. Step 3: Cross multiply
    718.91x = 992.09 × 404.19
  4. Step 4: Simplify right side
    718.91x = 400,990.84
  5. Step 5: Solve for x
    x = 400,990.84/718.91
  6. Step 6: Final answer
    x = 557.78

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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.