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Finding the Fourth Proportional to 551.44, 827.20 and 405.36

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Solution

The fourth proportional to 551.44, 827.20 and 405.36 is: 608.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.44 : 827.20 = 405.36 : x
  2. Step 2: Convert to fraction form
    551.44/827.20 = 405.36/x
  3. Step 3: Cross multiply
    551.44x = 827.20 × 405.36
  4. Step 4: Simplify right side
    551.44x = 335,313.79
  5. Step 5: Solve for x
    x = 335,313.79/551.44
  6. Step 6: Final answer
    x = 608.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.