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Finding the Fourth Proportional to 290.85, 436.02 and 108.21

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Solution

The fourth proportional to 290.85, 436.02 and 108.21 is: 162.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.85 : 436.02 = 108.21 : x
  2. Step 2: Convert to fraction form
    290.85/436.02 = 108.21/x
  3. Step 3: Cross multiply
    290.85x = 436.02 × 108.21
  4. Step 4: Simplify right side
    290.85x = 47,181.72
  5. Step 5: Solve for x
    x = 47,181.72/290.85
  6. Step 6: Final answer
    x = 162.22

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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.