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Finding the Fourth Proportional to 290.74, 398.29 and 280.22

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Solution

The fourth proportional to 290.74, 398.29 and 280.22 is: 383.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.74 : 398.29 = 280.22 : x
  2. Step 2: Convert to fraction form
    290.74/398.29 = 280.22/x
  3. Step 3: Cross multiply
    290.74x = 398.29 × 280.22
  4. Step 4: Simplify right side
    290.74x = 111,608.82
  5. Step 5: Solve for x
    x = 111,608.82/290.74
  6. Step 6: Final answer
    x = 383.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.