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Finding the Fourth Proportional to 719.50, 992.87 and 404.79

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Solution

The fourth proportional to 719.50, 992.87 and 404.79 is: 558.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.50 : 992.87 = 404.79 : x
  2. Step 2: Convert to fraction form
    719.50/992.87 = 404.79/x
  3. Step 3: Cross multiply
    719.50x = 992.87 × 404.79
  4. Step 4: Simplify right side
    719.50x = 401,898.88
  5. Step 5: Solve for x
    x = 401,898.88/719.50
  6. Step 6: Final answer
    x = 558.58

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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.