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Finding the Fourth Proportional to 290.82, 436.13 and 85.33

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Solution

The fourth proportional to 290.82, 436.13 and 85.33 is: 127.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.82 : 436.13 = 85.33 : x
  2. Step 2: Convert to fraction form
    290.82/436.13 = 85.33/x
  3. Step 3: Cross multiply
    290.82x = 436.13 × 85.33
  4. Step 4: Simplify right side
    290.82x = 37,214.97
  5. Step 5: Solve for x
    x = 37,214.97/290.82
  6. Step 6: Final answer
    x = 127.97

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.