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Finding the Fourth Proportional to 170.49, 235.18 and 108.21

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Solution

The fourth proportional to 170.49, 235.18 and 108.21 is: 149.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.49 : 235.18 = 108.21 : x
  2. Step 2: Convert to fraction form
    170.49/235.18 = 108.21/x
  3. Step 3: Cross multiply
    170.49x = 235.18 × 108.21
  4. Step 4: Simplify right side
    170.49x = 25,448.96
  5. Step 5: Solve for x
    x = 25,448.96/170.49
  6. Step 6: Final answer
    x = 149.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.