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Finding the Fourth Proportional to 290.86, 436.32 and 108.21

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Solution

The fourth proportional to 290.86, 436.32 and 108.21 is: 162.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.86 : 436.32 = 108.21 : x
  2. Step 2: Convert to fraction form
    290.86/436.32 = 108.21/x
  3. Step 3: Cross multiply
    290.86x = 436.32 × 108.21
  4. Step 4: Simplify right side
    290.86x = 47,213.27
  5. Step 5: Solve for x
    x = 47,213.27/290.86
  6. Step 6: Final answer
    x = 162.32

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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.