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Finding the Fourth Proportional to 290.78, 436.01 and 218.49

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Solution

The fourth proportional to 290.78, 436.01 and 218.49 is: 327.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.78 : 436.01 = 218.49 : x
  2. Step 2: Convert to fraction form
    290.78/436.01 = 218.49/x
  3. Step 3: Cross multiply
    290.78x = 436.01 × 218.49
  4. Step 4: Simplify right side
    290.78x = 95,263.82
  5. Step 5: Solve for x
    x = 95,263.82/290.78
  6. Step 6: Final answer
    x = 327.61

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Why These Related Problems?

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