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Finding the Fourth Proportional to 718.85, 992.07 and 404.21

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Solution

The fourth proportional to 718.85, 992.07 and 404.21 is: 557.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.85 : 992.07 = 404.21 : x
  2. Step 2: Convert to fraction form
    718.85/992.07 = 404.21/x
  3. Step 3: Cross multiply
    718.85x = 992.07 × 404.21
  4. Step 4: Simplify right side
    718.85x = 401,007.09
  5. Step 5: Solve for x
    x = 401,007.09/718.85
  6. Step 6: Final answer
    x = 557.84

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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.