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Finding the Fourth Proportional to 405.98, 608.90 and 109.49

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Solution

The fourth proportional to 405.98, 608.90 and 109.49 is: 164.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.98 : 608.90 = 109.49 : x
  2. Step 2: Convert to fraction form
    405.98/608.90 = 109.49/x
  3. Step 3: Cross multiply
    405.98x = 608.90 × 109.49
  4. Step 4: Simplify right side
    405.98x = 66,669.44
  5. Step 5: Solve for x
    x = 66,669.44/405.98
  6. Step 6: Final answer
    x = 164.22

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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.