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Finding the Fourth Proportional to 719.33, 992.78 and 439.73

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Solution

The fourth proportional to 719.33, 992.78 and 439.73 is: 606.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.33 : 992.78 = 439.73 : x
  2. Step 2: Convert to fraction form
    719.33/992.78 = 439.73/x
  3. Step 3: Cross multiply
    719.33x = 992.78 × 439.73
  4. Step 4: Simplify right side
    719.33x = 436,547.99
  5. Step 5: Solve for x
    x = 436,547.99/719.33
  6. Step 6: Final answer
    x = 606.89

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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.