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Finding the Fourth Proportional to 290.44, 400.60 and 280.92

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Solution

The fourth proportional to 290.44, 400.60 and 280.92 is: 387.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.44 : 400.60 = 280.92 : x
  2. Step 2: Convert to fraction form
    290.44/400.60 = 280.92/x
  3. Step 3: Cross multiply
    290.44x = 400.60 × 280.92
  4. Step 4: Simplify right side
    290.44x = 112,536.55
  5. Step 5: Solve for x
    x = 112,536.55/290.44
  6. Step 6: Final answer
    x = 387.47

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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.