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Finding the Fourth Proportional to 404.39, 557.75 and 280.26

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Solution

The fourth proportional to 404.39, 557.75 and 280.26 is: 386.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.39 : 557.75 = 280.26 : x
  2. Step 2: Convert to fraction form
    404.39/557.75 = 280.26/x
  3. Step 3: Cross multiply
    404.39x = 557.75 × 280.26
  4. Step 4: Simplify right side
    404.39x = 156,315.72
  5. Step 5: Solve for x
    x = 156,315.72/404.39
  6. Step 6: Final answer
    x = 386.54

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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.