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Finding the Fourth Proportional to 719.39, 992.86 and 404.78

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Solution

The fourth proportional to 719.39, 992.86 and 404.78 is: 558.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.39 : 992.86 = 404.78 : x
  2. Step 2: Convert to fraction form
    719.39/992.86 = 404.78/x
  3. Step 3: Cross multiply
    719.39x = 992.86 × 404.78
  4. Step 4: Simplify right side
    719.39x = 401,887.62
  5. Step 5: Solve for x
    x = 401,887.62/719.39
  6. Step 6: Final answer
    x = 558.65

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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.