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Finding the Fourth Proportional to 719.26, 992.45 and 408.76

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Solution

The fourth proportional to 719.26, 992.45 and 408.76 is: 564.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.26 : 992.45 = 408.76 : x
  2. Step 2: Convert to fraction form
    719.26/992.45 = 408.76/x
  3. Step 3: Cross multiply
    719.26x = 992.45 × 408.76
  4. Step 4: Simplify right side
    719.26x = 405,666.86
  5. Step 5: Solve for x
    x = 405,666.86/719.26
  6. Step 6: Final answer
    x = 564.01

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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.