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Finding the Fourth Proportional to 290.88, 401.49 and 279.09

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Solution

The fourth proportional to 290.88, 401.49 and 279.09 is: 385.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.88 : 401.49 = 279.09 : x
  2. Step 2: Convert to fraction form
    290.88/401.49 = 279.09/x
  3. Step 3: Cross multiply
    290.88x = 401.49 × 279.09
  4. Step 4: Simplify right side
    290.88x = 112,051.84
  5. Step 5: Solve for x
    x = 112,051.84/290.88
  6. Step 6: Final answer
    x = 385.22

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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.