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Finding the Fourth Proportional to 290.81, 401.29 and 208.11

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Solution

The fourth proportional to 290.81, 401.29 and 208.11 is: 287.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.81 : 401.29 = 208.11 : x
  2. Step 2: Convert to fraction form
    290.81/401.29 = 208.11/x
  3. Step 3: Cross multiply
    290.81x = 401.29 × 208.11
  4. Step 4: Simplify right side
    290.81x = 83,512.36
  5. Step 5: Solve for x
    x = 83,512.36/290.81
  6. Step 6: Final answer
    x = 287.17

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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.