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Finding the Fourth Proportional to 719.62, 992.84 and 439.75

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Solution

The fourth proportional to 719.62, 992.84 and 439.75 is: 606.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.62 : 992.84 = 439.75 : x
  2. Step 2: Convert to fraction form
    719.62/992.84 = 439.75/x
  3. Step 3: Cross multiply
    719.62x = 992.84 × 439.75
  4. Step 4: Simplify right side
    719.62x = 436,601.39
  5. Step 5: Solve for x
    x = 436,601.39/719.62
  6. Step 6: Final answer
    x = 606.71

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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.