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Finding the Fourth Proportional to 290.91, 436.07 and 108.21

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Solution

The fourth proportional to 290.91, 436.07 and 108.21 is: 162.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.91 : 436.07 = 108.21 : x
  2. Step 2: Convert to fraction form
    290.91/436.07 = 108.21/x
  3. Step 3: Cross multiply
    290.91x = 436.07 × 108.21
  4. Step 4: Simplify right side
    290.91x = 47,187.41
  5. Step 5: Solve for x
    x = 47,187.41/290.91
  6. Step 6: Final answer
    x = 162.21

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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.