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Finding the Fourth Proportional to 404.82, 558.18 and 280.55

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Solution

The fourth proportional to 404.82, 558.18 and 280.55 is: 386.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.82 : 558.18 = 280.55 : x
  2. Step 2: Convert to fraction form
    404.82/558.18 = 280.55/x
  3. Step 3: Cross multiply
    404.82x = 558.18 × 280.55
  4. Step 4: Simplify right side
    404.82x = 156,598.79
  5. Step 5: Solve for x
    x = 156,598.79/404.82
  6. Step 6: Final answer
    x = 386.84

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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.